[llvm] [DebugInfo][NewGVN] Fix debug value loss (PR #147634)

[Vladislav Dzhidzhoev via llvm-commits]

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@@ -4076,6 +4076,7 @@ bool NewGVN::eliminateInstructions(Function &F) {
                 if (!match(DefI, m_Intrinsic<Intrinsic::ssa_copy>()))
                   patchReplacementInstruction(DefI, DominatingLeader);
 
+                salvageDebugInfo(*DefI);
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dzhidzhoev wrote:

Should this be moved inside the loop https://github.com/llvm/llvm-project/blob/95cb8336d1598780d66eeb85d8fcb1c9a433a459/llvm/lib/Transforms/Scalar/NewGVN.cpp#L3527 to salvage more instructions?

https://github.com/llvm/llvm-project/pull/147634