[llvm] [X86] Fix typo: QWORD alignment is greater than 4, not 8 (PR #87819)

[Phoebe Wang via llvm-commits]

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@@ -86,7 +86,7 @@ SDValue X86SelectionDAGInfo::EmitTargetCodeForMemset(
       ValReg = X86::EAX;
       Val = (Val << 8)  | Val;
       Val = (Val << 16) | Val;
-      if (Subtarget.is64Bit() && Alignment > Align(8)) { // QWORD aligned
+      if (Subtarget.is64Bit() && Alignment > Align(4)) { // QWORD aligned
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phoebewang wrote:

Maybe use `>= Align(8)` for better understanding?

https://github.com/llvm/llvm-project/pull/87819