[llvm] [DebugInfo][RemoveDIs] Make dropping variable locations explicit (PR #72399)

[Orlando Cazalet-Hyams via llvm-commits]

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@@ -5179,6 +5184,15 @@ bool SimplifyCFGOpt::simplifyUnreachable(UnreachableInst *UI) {
 
   bool Changed = false;
 
+  // Ensure that any debug-info records that used to occur after the Unreachable
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OCHyams wrote:

A few lines up there's an ominous comment `// WARNING: keep in sync with InstCombinerImpl::visitUnreachableInst()!` - does anything over there need changing?

https://github.com/llvm/llvm-project/pull/72399