[AArch64] Disable MachineOutliner on Windows.

The handling of unwind info is broken, so disable it for now.

Author: efriedma-quic

llvm/lib/Target/AArch64/AArch64InstrInfo.cpp

@@ -6106,6 +6106,10 @@ bool AArch64InstrInfo::isFunctionSafeToOutlineFrom(
   if (!AFI || AFI->hasRedZone().getValueOr(true))
     return false;
 
+  // FIXME: Teach the outliner to generate/handle Windows unwind info.
+  if (MF.getTarget().getMCAsmInfo()->usesWindowsCFI())
+    return false;
+
   // It's safe to outline from MF.
   return true;
 }

llvm/test/CodeGen/AArch64/machine-outliner-calls.mir

@@ -1,4 +1,5 @@
 # RUN: llc -mtriple=aarch64--- -run-pass=prologepilog -run-pass=machine-outliner -verify-machineinstrs %s -o - | FileCheck %s
+# RUN: llc -mtriple=aarch64-pc-windows-msvc -run-pass=prologepilog -run-pass=machine-outliner -verify-machineinstrs %s -o - | FileCheck %s -check-prefix=WINDOWS
 --- |
   define void @baz() #0 {
     ret void
@@ -65,3 +66,4 @@ body:             |
 # CHECK-NEXT: $w17 = ORRWri $wzr, 1
 # CHECK-NEXT: early-clobber $sp, $lr = LDRXpost $sp, 16
 # CHECK-NEXT: RET $lr
+# WINDOWS-NOT: OUTLINED