[llvm] [MemCpyOpt] move SrcAlloca to the entry if transformation is performed (PR #67226)

[Kohei Asano via llvm-commits]

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@@ -346,7 +365,6 @@ define void @avoid_memory_use_last_user_crash() {
   ret void
 }
 
-; TODO: if the last user is terminator, we won't insert lifetime.end.
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khei4 wrote:

Sorry, this and L721 were residues for https://reviews.llvm.org/D155406.

https://github.com/llvm/llvm-project/pull/67226