[llvm] [LLVM][MemCpyOpt] Unify alias tags if we optimize allocas (PR #129537)

[Nikita Popov via llvm-commits]

================
@@ -1569,6 +1569,10 @@ bool MemCpyOptPass::performStackMoveOptzn(Instruction *Load, Instruction *Store,
               continue;
             }
           }
+          if (UI->hasMetadata(LLVMContext::MD_tbaa))
----------------
nikic wrote:

I'd combine these checks with `||`, no need to repeat the insert thrice.

https://github.com/llvm/llvm-project/pull/129537