[llvm] [AArch64] Use GISel for optnone functions (PR #174746)

[Ryan Cowan via llvm-commits]

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@@ -733,7 +744,12 @@ bool AArch64PassConfig::addIRTranslator() {
 }
 
 void AArch64PassConfig::addPreLegalizeMachineIR() {
-  if (getOptLevel() == CodeGenOptLevel::None) {
+  const bool GlobalISelFlag =
+      getCGPassBuilderOption().EnableGlobalISelOption.value_or(false);
+  if (getOptLevel() == CodeGenOptLevel::None ||
+      (static_cast<unsigned>(getOptLevel()) >
+           this->getAArch64TargetMachine().getEnableGlobalISelAtO() &&
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HolyMolyCowMan wrote:

We can remove `this->`, good spot.

I agree, is this something that the 'new' pass manager might be able to help with?

https://github.com/llvm/llvm-project/pull/174746