Include X86CallFrameOptimization in the opt-bisect process

[andrew.w.kaylor]

Summary

This patch updates the X86CallFrameOptimization in such a way that it can be skipped when using the -opt-bisect-limit option.

This pass was not included when I originally implemented this feature in the x86-specific passes (see D19439) because at that time it was being run at -O0. Since D22362 introduced a check to omit this pass at -O0 it can now also be included in the opt-bisect process.

The change I am making here will also cause this pass to be skipped for any function that has the opt-none function attribute.

[mkuper]

Thanks Andy, LGTM!

llvm/trunk/lib/Target/X86/X86CallFrameOptimization.cpp

bool X86CallFrameOptimization::runOnMachineFunction(MachineFunction &MF) {
   MRI = &MF.getRegInfo();
 
   const X86RegisterInfo &RegInfo =
       *static_cast<const X86RegisterInfo *>(STI->getRegisterInfo());
   SlotSize = RegInfo.getSlotSize();
   assert(isPowerOf2_32(SlotSize) && "Expect power of 2 stack slot size");
   Log2SlotSize = Log2_32(SlotSize);
 
-  if (!isLegal(MF))
+  if (skipFunction(*MF.getFunction()) || !isLegal(MF))
     return false;
 
   unsigned FrameSetupOpcode = TII->getCallFrameSetupOpcode();
 
   bool Changed = false;
 
   ContextVector CallSeqVector;