[llvm] [X86] Fix store MMO offset in breakBlockedCopies (PR #202904)

[Phoebe Wang via llvm-commits]

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@@ -612,7 +612,7 @@ void X86AvoidSFBImpl::breakBlockedCopies(
   }
   unsigned Size3 = (LdDispImm + getRegSizeInBytes(LoadInst)) - LdDisp1;
   buildCopies(Size3, LoadInst, LdDisp1, StoreInst, StDisp1, LMMOffset,
-              LMMOffset);
+              SMMOffset);
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phoebewang wrote:

Since they are equal, maybe better to simplify to `Offset` and use for both.

https://github.com/llvm/llvm-project/pull/202904