Index: lib/CodeGen/LiveDebugValues.cpp
===================================================================
--- lib/CodeGen/LiveDebugValues.cpp
+++ lib/CodeGen/LiveDebugValues.cpp
@@ -430,9 +430,15 @@
   MachineFunction *MF = MI.getParent()->getParent();
   MachineInstr *NewDebugInstr;
 
-  auto ProcessVarLoc = [&MI, &OpenRanges, &Transfers,
+  auto ProcessVarLoc = [&MI, &OpenRanges, &Transfers, &DebugInstr,
                         &VarLocIDs](VarLoc &VL, MachineInstr *NewDebugInstr) {
     unsigned LocId = VarLocIDs.insert(VL);
+
+    // Close this variable's previous location range.
+    DebugVariable V(DebugInstr->getDebugVariable(),
+                    DebugInstr->getDebugLoc()->getInlinedAt());
+    OpenRanges.erase(V);
+
     OpenRanges.insert(LocId, VL.Var);
     // The newly created DBG_VALUE instruction NewDebugInstr must be inserted
     // after MI. Keep track of the pairing.
@@ -708,6 +714,10 @@
   });
   VarLocSet &VLS = OutLocs[CurMBB];
   Changed = VLS |= OpenRanges.getVarLocs();
+  // New OutLocs set may be different due to spill, restore or register
+  // copy instruction processing.
+  if (Changed)
+    VLS = OpenRanges.getVarLocs();
   OpenRanges.clear();
   return Changed;
 }
Index: test/DebugInfo/X86/fission-ranges.ll
===================================================================
--- test/DebugInfo/X86/fission-ranges.ll
+++ test/DebugInfo/X86/fission-ranges.ll
@@ -5,6 +5,18 @@
 ; RUN: llc -dwarf-version=5 -O0 %s -mtriple=x86_64-unknown-linux-gnu -filetype=obj -o %t
 ; RUN: llvm-dwarfdump -v %t | FileCheck --check-prefix=V5RNGLISTS %s
 
+; RUN: llc -O0 %s -mtriple=x86_64-unknown-linux-gnu -stop-after=livedebugvalues -o -| FileCheck --check-prefix=CHECK-MIR %s
+
+; LiveDebugValues should produce DBG_VALUEs for variable "b" in successive
+; blocks once we recognize that it is spilled.
+; CHECK-MIR: ![[BDIVAR:[0-9]+]] = !DILocalVariable(name: "b"
+; CHECK-MIR: DBG_VALUE $rsp, 0, ![[BDIVAR]], !DIExpression(DW_OP_constu, 32, DW_OP_minus)
+; CHECK-MIR-LABEL: bb.6.for.inc13:
+; CHECK-MIR: DBG_VALUE $rsp, 0, ![[BDIVAR]], !DIExpression(DW_OP_constu, 32, DW_OP_minus)
+; CHECK-MIR-LABEL: bb.7.for.inc16:
+; CHECK-MIR: DBG_VALUE $rsp, 0, ![[BDIVAR]], !DIExpression(DW_OP_constu, 32, DW_OP_minus)
+
+
 ; CHECK: .debug_info contents:
 ; CHECK: DW_TAG_compile_unit
 ; CHECK-NEXT: DW_AT_stmt_list
@@ -31,22 +43,25 @@
 
 ; CHECK:      [[A]]:
 ; CHECK-NEXT:   Addr idx 2 (w/ length 169): DW_OP_consts +0, DW_OP_stack_value
-; CHECK-NEXT:   Addr idx 3 (w/ length 25): DW_OP_reg0 RAX
+; CHECK-NEXT:   Addr idx 3 (w/ length 15): DW_OP_reg0 RAX
+; CHECK-NEXT:   Addr idx 4 (w/ length 18): DW_OP_breg7 RSP-8
 ; CHECK:      [[E]]:
-; CHECK-NEXT:   Addr idx 4 (w/ length 19): DW_OP_reg0 RAX
+; CHECK-NEXT:   Addr idx 5 (w/ length 23): DW_OP_reg0 RAX
 ; CHECK:      [[B]]:
-; CHECK-NEXT:   Addr idx 5 (w/ length 17): DW_OP_reg0 RAX
+; CHECK-NEXT:   Addr idx 6 (w/ length 15): DW_OP_reg0 RAX
+; CHECK-NEXT:   Addr idx 7 (w/ length 66): DW_OP_breg7 RSP-32
 ; CHECK:      [[D]]:
-; CHECK-NEXT:   Addr idx 6 (w/ length 17): DW_OP_reg0 RAX
+; CHECK-NEXT:   Addr idx 8 (w/ length 15): DW_OP_reg0 RAX
+; CHECK-NEXT:   Addr idx 9 (w/ length 42): DW_OP_breg7 RSP-20
 
 ; Make sure we don't produce any relocations in any .dwo section (though in particular, debug_info.dwo)
 ; HDR-NOT: .rela.{{.*}}.dwo
 
 ; Make sure we have enough stuff in the debug_addr to cover the address indexes
-; (6 is the last index in debug_loc.dwo, making 7 entries of 8 bytes each, 7 * 8
-; == 56 base 10 == 38 base 16)
+; (9 is the last index in debug_loc.dwo, making 10 entries of 8 bytes each,
+; 10 * 8 == 80 base 10 == 50 base 16)
 
-; HDR: .debug_addr 00000038
+; HDR: .debug_addr 00000050
 ; HDR-NOT: .rela.{{.*}}.dwo
 
 ; Check for the existence of a DWARF v5-style range list table in the .debug_rnglists
@@ -134,13 +149,13 @@
   tail call void @llvm.dbg.value(metadata i32* @c, metadata !19, metadata !DIExpression()), !dbg !40
   %and = and i32 %and2, 1, !dbg !32
   %inc = add i32 %e.01, 1, !dbg !39
-  tail call void @llvm.dbg.value(metadata i32 %inc, metadata !18, metadata !DIExpression()), !dbg !39
+  tail call void @llvm.dbg.value(metadata i32 %inc, metadata !18, metadata !DIExpression()), !dbg !42
   %exitcond = icmp eq i32 %inc, 30, !dbg !39
   br i1 %exitcond, label %for.inc10, label %for.body9, !dbg !39
 
 for.inc10:                                        ; preds = %for.body9
   %inc11 = add nsw i32 %b.03, 1, !dbg !38
-  tail call void @llvm.dbg.value(metadata i32 %inc11, metadata !15, metadata !DIExpression()), !dbg !38
+  tail call void @llvm.dbg.value(metadata i32 %inc11, metadata !15, metadata !DIExpression()), !dbg !42
   %exitcond11 = icmp eq i32 %inc11, 30, !dbg !38
   br i1 %exitcond11, label %for.inc13, label %for.cond7.preheader, !dbg !38