[llvm] [AArch64][CodeGen] Optimize security cookie check with New Fixup Pass (PR #121938)

[Eli Friedman via llvm-commits]

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@@ -812,6 +812,7 @@ void AArch64PassConfig::addPreRegAlloc() {
   }
   if (TM->getOptLevel() != CodeGenOptLevel::None && EnableMachinePipeliner)
     addPass(&MachinePipelinerID);
+  addPass(createAArch64WinFixupBufferSecurityCheckPass());
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efriedma-quic wrote:

Should we check `TM->getOptLevel()`?  Maybe also move the `isWindowsMSVCEnvironment()` check here.

https://github.com/llvm/llvm-project/pull/121938