[CodeGen] Return better Changed status from LocalStackSlotAllocation

[myhsu]

LGTM

llvm/lib/CodeGen/LocalStackSlotAllocation.cpp

 bool LocalStackSlotPass::runOnMachineFunction(MachineFunction &MF) {
   MachineFrameInfo &MFI = MF.getFrameInfo();
   const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
   unsigned LocalObjectCount = MFI.getObjectIndexEnd();
 
   // If the target doesn't want/need this pass, or if there are no locals
   // to consider, early exit.
   if (LocalObjectCount == 0 || !TRI->requiresVirtualBaseRegisters(MF))
-    return true;
+    return false;
 
   // Make sure we have enough space to store the local offsets.
   LocalOffsets.resize(MFI.getObjectIndexEnd());
 
   // Lay out the local blob.
   calculateFrameObjectOffsets(MF);
 
   // Insert virtual base registers to resolve frame index references.