[llvm] [AMDGPU] Avoid dangling SSAUpdater reference in PromoteAlloca full-vector store (PR #215686)

[via llvm-commits]

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@@ -52,6 +53,60 @@ using namespace llvm;
 
 namespace {
 
+/// Wrapper around SSAUpdater that uses TrackingVH to keep available values
+/// up-to-date when the original values are RAUW'd or deleted.  The plain
+/// SSAUpdater stores raw Value* pointers that become dangling when a value it
+/// holds is replaced and erased.
+class TrackingSSAUpdater {
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carlobertolli wrote:

done, moved next to SSAUpdater.

https://github.com/llvm/llvm-project/pull/215686