[llvm] [LiveDebugVariables] Stop holding SlotIndexes for erased instructions (PR #224467)

[Petar Jovanovic via llvm-commits]

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@@ -0,0 +1,57 @@
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx90a -O3 -stop-after=virtregrewriter,2 < %s | FileCheck %s
+
+; LiveDebugVariables is built before the SGPR allocator and still holds
+; SlotIndexes when the VGPR allocator spills %v1 several passes later. The two
+; intervals recorded for %v1 around the spill resolve onto the same position, so
+; only one DBG_VALUE belongs there. Without canonicalizeIndexes() each interval
+; emits its own and the last CHECK-NEXT lands on the duplicate.
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petar-jovanovic wrote:

Applied both. Thanks.

https://github.com/llvm/llvm-project/pull/224467