[llvm] [InstCombine] Remove Store which has one-use AddrSpaceCastInst as Ptr (#68120) (PR #79565)

[Matt Arsenault via llvm-commits]

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@@ -345,6 +345,22 @@ define void @store_to_readonly_noalias(ptr readonly noalias %0) {
   ret void
 }
 
+; if ptr which store to is addrspacecast, and its target is alloca. remove it.
+define void @src_store_oneuse_addrspaceast_alloca(ptr align 8 %arg) {
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arsenm wrote:

I just checked. I see the fix point error without any flags, so it's fine.

https://github.com/llvm/llvm-project/pull/79565