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.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/ARM/machine-outliner-remove-debug-instr.ll
@@ -0,0 +1,95 @@
+; RUN: llc --verify-machineinstrs --stop-after=machine-outliner %s -o - | FileCheck %s
+target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
+target triple = "thumbv8.1m.main-unknown-unknown-eabi"
+
+; Derived from
+; volatile int a, b, c, d, e, f, g, h;
+;
+; int x() {
+;   int r = (a + b) / (c + d) + e + f;
+;   return r + 1;
+; }
+;
+; int y() {
+;   int r = (a + b) / (c + d) + e + f;
+;   return r + 2;
+; }
+; Checks that debug instructions are removed form the outlined function.
+
+; CHECK-LABEL: name: OUTLINED_FUNCTION_0
+; CHECK-NOT:   DBG_VALUE
+
+@a = dso_local global i32 0, align 4
+@b = dso_local global i32 0, align 4
+@c = dso_local global i32 0, align 4
+@d = dso_local global i32 0, align 4
+@e = dso_local global i32 0, align 4
+@f = dso_local global i32 0, align 4
+@g = dso_local local_unnamed_addr global i32 0, align 4
+@h = dso_local local_unnamed_addr global i32 0, align 4
+
+define dso_local i32 @x() local_unnamed_addr #0 !dbg !8 {
+entry:
+  %0 = load volatile i32, i32* @a, align 4
+  %1 = load volatile i32, i32* @b, align 4
+  %add = add nsw i32 %1, %0
+  %2 = load volatile i32, i32* @c, align 4
+  %3 = load volatile i32, i32* @d, align 4
+  %add1 = add nsw i32 %3, %2
+  %div = sdiv i32 %add, %add1
+  %4 = load volatile i32, i32* @e, align 4
+  %5 = load volatile i32, i32* @f, align 4
+  call void @llvm.dbg.value(metadata i32 undef, metadata !12, metadata !DIExpression()), !dbg !13
+  %add2 = add i32 %div, 1
+  %add3 = add i32 %add2, %4
+  %add4 = add i32 %add3, %5
+  ret i32 %add4
+}
+
+define dso_local i32 @y() local_unnamed_addr #0 !dbg !14 {
+entry:
+  %0 = load volatile i32, i32* @a, align 4
+  %1 = load volatile i32, i32* @b, align 4
+  %add = add nsw i32 %1, %0
+  %2 = load volatile i32, i32* @c, align 4
+  %3 = load volatile i32, i32* @d, align 4
+  %add1 = add nsw i32 %3, %2
+  %div = sdiv i32 %add, %add1
+  %4 = load volatile i32, i32* @e, align 4
+  %5 = load volatile i32, i32* @f, align 4
+  call void @llvm.dbg.value(metadata i32 undef, metadata !16, metadata !DIExpression()), !dbg !17
+  %add2 = add i32 %div, 2
+  %add3 = add i32 %add2, %4
+  %add4 = add i32 %add3, %5
+  ret i32 %add4
+}
+
+declare void @llvm.dbg.value(metadata, metadata, metadata) #1
+
+attributes #0 = { minsize nofree norecurse nounwind optsize }
+attributes #1 = { nounwind readnone speculatable willreturn }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!4, !5, !6, !7}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "test.c", directory: "build")
+!2 = !{}
+!3 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!4 = !{i32 7, !"Dwarf Version", i32 4}
+!5 = !{i32 2, !"Debug Info Version", i32 3}
+!6 = !{i32 1, !"wchar_size", i32 4}
+!7 = !{i32 1, !"min_enum_size", i32 4}
+
+!8 = distinct !DISubprogram(name: "x", scope: !1, file: !1, line: 3, type: !9, scopeLine: 3, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
+!9 = !DISubroutineType(types: !10)
+!10 = !{!3}
+!11 = !{!12}
+!12 = !DILocalVariable(name: "r", scope: !8, file: !1, line: 4, type: !3)
+
+!13 = !DILocation(line: 0, scope: !8)
+!14 = distinct !DISubprogram(name: "y", scope: !1, file: !1, line: 9, type: !9, scopeLine: 9, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !15)
+!15 = !{!16}
+!16 = !DILocalVariable(name: "r", scope: !14, file: !1, line: 10, type: !3)
+!17 = !DILocation(line: 0, scope: !14)
+