Index: llvm/lib/CodeGen/MachineOutliner.cpp
===================================================================
--- llvm/lib/CodeGen/MachineOutliner.cpp
+++ llvm/lib/CodeGen/MachineOutliner.cpp
@@ -654,6 +654,8 @@
       OriginalMF->getFrameInstructions();
   for (auto I = FirstCand.front(), E = std::next(FirstCand.back()); I != E;
        ++I) {
+    if (I->isDebugInstr())
+      continue;
     MachineInstr *NewMI = MF.CloneMachineInstr(&*I);
     if (I->isCFIInstruction()) {
       unsigned CFIIndex = NewMI->getOperand(0).getCFIIndex();
Index: llvm/test/CodeGen/ARM/machine-outliner-remove-debug-instr.mir
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/ARM/machine-outliner-remove-debug-instr.mir
@@ -0,0 +1,171 @@
+# RUN: llc -verify-machineinstrs -run-pass=machine-outliner -mtriple=thumbv7m-none-eabi %s -o - | FileCheck %s
+
+# Check the outlined function does not contain debug instructions
+# CHECK-LABEL: name: f
+# CHECK:       tBL {{.*}}  @OUTLINED_FUNCTION_0,
+
+# CHECK-LABEL: name: g
+# CHECK:       tBL {{.*}}  @OUTLINED_FUNCTION_0,
+
+# CHECK-LABEL: name: OUTLINED_FUNCTION_0
+# CHECK-NOT:   DBG_VALUE
+# CHECK:       tTAILJMPdND @h
+--- |
+  source_filename = "x.ll"
+  target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
+
+  define void @f() {
+    entry:
+      br label %if.end
+    if.end:
+      br label %return
+    return:
+      ret void
+  }
+
+  define void @g() {
+  entry:
+    br label %if.end
+  if.end:
+    br label %return
+  return:
+    ret void
+  }
+
+  define void @h() { entry: ret void }
+...
+---
+name:            h
+tracksRegLiveness: true
+body:             |
+  bb.0.entry:
+    liveins: $r0, $r1
+
+    DBG_VALUE $r0, $noreg
+    DBG_VALUE $r1, $noreg
+    renamable $r0 = nsw tADDhirr killed renamable $r0, killed renamable $r1, 14 /* CC::al */, $noreg
+    DBG_VALUE $r0, $noreg
+    tBX_RET 14 /* CC::al */, $noreg, implicit killed $r0
+...
+---
+name:            f
+tracksRegLiveness: true
+body:             |
+  bb.0.entry:
+    successors: %bb.1(0x30000000), %bb.2(0x50000000)
+    liveins: $r0, $r1, $r2, $r3, $lr, $r6, $r5, $r4
+
+    DBG_VALUE $r0, $noreg
+    DBG_VALUE $r1, $noreg
+    DBG_VALUE $r2, $noreg
+    DBG_VALUE $r3, $noreg
+    tCMPi8 renamable $r0, 0, 14 /* CC::al */, $noreg, implicit-def $cpsr
+    t2Bcc %bb.1, 4 /* CC::mi */, killed $cpsr
+
+  bb.2.if.end:
+    liveins: $r0, $r1, $r2, $r3, $r4, $r5, $r6, $lr
+
+    DBG_VALUE $r3, $noreg
+    DBG_VALUE $r2, $noreg
+    DBG_VALUE $r1, $noreg
+    DBG_VALUE $r0, $noreg
+    frame-setup tPUSH 14 /* CC::al */, $noreg, killed $r4, killed $r5, killed $r6, killed $lr, implicit-def $sp, implicit $sp
+    frame-setup CFI_INSTRUCTION def_cfa_offset 16
+    frame-setup CFI_INSTRUCTION offset $lr, -4
+    frame-setup CFI_INSTRUCTION offset $r6, -8
+    frame-setup CFI_INSTRUCTION offset $r5, -12
+    frame-setup CFI_INSTRUCTION offset $r4, -16
+    $r6 = tMOVr killed $r1, 14 /* CC::al */, $noreg
+    DBG_VALUE $r6, $noreg
+    DBG_VALUE $r6, $noreg
+    renamable $r1, dead $cpsr = tMOVi8 11, 14 /* CC::al */, $noreg
+    renamable $r0, dead $cpsr = nsw tMUL killed renamable $r1, killed renamable $r0, 14 /* CC::al */, $noreg
+    DBG_VALUE $r0, $noreg
+    $r1 = tMOVr $r6, 14 /* CC::al */, $noreg
+    $r4 = tMOVr killed $r3, 14 /* CC::al */, $noreg
+    DBG_VALUE $r4, $noreg
+    $r5 = tMOVr killed $r2, 14 /* CC::al */, $noreg
+    DBG_VALUE $r5, $noreg
+    renamable $r0, dead $cpsr = nsw tSUBrr killed renamable $r0, renamable $r6, 14 /* CC::al */, $noreg
+    tBL 14 /* CC::al */, $noreg, @h, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit killed $r1, implicit-def $sp, implicit-def $r0
+    DBG_VALUE $r0, $noreg
+    renamable $r1, dead $cpsr = nsw tADDrr renamable $r0, killed renamable $r6, 14 /* CC::al */, $noreg
+    renamable $r0, dead $cpsr = nsw tMUL killed renamable $r1, killed renamable $r0, 14 /* CC::al */, $noreg
+    DBG_VALUE $r0, $noreg
+    renamable $r1, dead $cpsr = nsw tADDrr killed renamable $r4, killed renamable $r5, 14 /* CC::al */, $noreg
+    renamable $r0 = t2SDIV killed renamable $r0, killed renamable $r1, 14 /* CC::al */, $noreg
+    renamable $r0, dead $cpsr = nsw tADDi8 killed renamable $r0, 2, 14 /* CC::al */, $noreg
+    frame-destroy tPOP_RET 14 /* CC::al */, $noreg, def $r4, def $r5, def $r6, def $pc, implicit killed $r0
+
+  bb.1:
+    liveins: $lr, $r6, $r5, $r4
+
+    DBG_VALUE $r3, $noreg
+    DBG_VALUE $r2, $noreg
+    DBG_VALUE $r1, $noreg
+    DBG_VALUE $r0, $noreg
+    renamable $r0 = t2MOVi -1, 14 /* CC::al */, $noreg, $noreg
+    DBG_VALUE $r0, $noreg
+    tBX_RET 14 /* CC::al */, $noreg, implicit killed $r0
+...
+---
+name:            g
+tracksRegLiveness: true
+body:             |
+  bb.0.entry:
+    successors: %bb.1(0x30000000), %bb.2(0x50000000)
+    liveins: $r0, $r1, $r2, $r3, $lr, $r6, $r5, $r4
+
+    DBG_VALUE $r0, $noreg
+    DBG_VALUE $r1, $noreg
+    DBG_VALUE $r2, $noreg
+    DBG_VALUE $r3, $noreg
+    tCMPi8 renamable $r0, 0, 14 /* CC::al */, $noreg, implicit-def $cpsr
+    t2Bcc %bb.1, 4 /* CC::mi */, killed $cpsr
+
+  bb.2.if.end:
+    liveins: $r0, $r1, $r2, $r3, $r4, $r5, $r6, $lr
+
+    DBG_VALUE $r3, $noreg
+    DBG_VALUE $r2, $noreg
+    DBG_VALUE $r1, $noreg
+    DBG_VALUE $r0, $noreg
+    frame-setup tPUSH 14 /* CC::al */, $noreg, killed $r4, killed $r5, killed $r6, killed $lr, implicit-def $sp, implicit $sp
+    frame-setup CFI_INSTRUCTION def_cfa_offset 16
+    frame-setup CFI_INSTRUCTION offset $lr, -4
+    frame-setup CFI_INSTRUCTION offset $r6, -8
+    frame-setup CFI_INSTRUCTION offset $r5, -12
+    frame-setup CFI_INSTRUCTION offset $r4, -16
+    $r6 = tMOVr killed $r1, 14 /* CC::al */, $noreg
+    DBG_VALUE $r6, $noreg
+    renamable $r1, dead $cpsr = tMOVi8 11, 14 /* CC::al */, $noreg
+    renamable $r0, dead $cpsr = nsw tMUL killed renamable $r1, killed renamable $r0, 14 /* CC::al */, $noreg
+    DBG_VALUE $r0, $noreg
+    $r1 = tMOVr $r6, 14 /* CC::al */, $noreg
+    $r4 = tMOVr killed $r3, 14 /* CC::al */, $noreg
+    DBG_VALUE $r4, $noreg
+    $r5 = tMOVr killed $r2, 14 /* CC::al */, $noreg
+    DBG_VALUE $r5, $noreg
+    renamable $r0, dead $cpsr = nsw tSUBrr killed renamable $r0, renamable $r6, 14 /* CC::al */, $noreg
+    tBL 14 /* CC::al */, $noreg, @h, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit killed $r1, implicit-def $sp, implicit-def $r0
+    DBG_VALUE $r0, $noreg
+    renamable $r1, dead $cpsr = nsw tADDrr renamable $r0, killed renamable $r6, 14 /* CC::al */, $noreg
+    renamable $r0, dead $cpsr = nsw tMUL killed renamable $r1, killed renamable $r0, 14 /* CC::al */, $noreg
+    DBG_VALUE $r0, $noreg
+    renamable $r1, dead $cpsr = nsw tADDrr killed renamable $r4, killed renamable $r5, 14 /* CC::al */, $noreg
+    renamable $r0 = t2SDIV killed renamable $r0, killed renamable $r1, 14 /* CC::al */, $noreg
+    renamable $r0, dead $cpsr = nsw tADDi8 killed renamable $r0, 1, 14 /* CC::al */, $noreg
+    frame-destroy tPOP_RET 14 /* CC::al */, $noreg, def $r4, def $r5, def $r6, def $pc, implicit killed $r0
+
+  bb.1:
+    liveins: $lr, $r6, $r5, $r4
+
+    DBG_VALUE $r3, $noreg
+    DBG_VALUE $r2, $noreg
+    DBG_VALUE $r1, $noreg
+    DBG_VALUE $r0, $noreg
+    renamable $r0 = t2MOVi -1, 14 /* CC::al */, $noreg, $noreg
+    DBG_VALUE $r0, $noreg
+    tBX_RET 14 /* CC::al */, $noreg, implicit killed $r0
+
+...