If a function has no stack frame at all, dynamic realignment isn't necessary.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86057 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMBaseRegisterInfo.cpp

@@ -514,6 +514,7 @@ needsStackRealignment(const MachineFunction &MF) const {
   unsigned StackAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
   return (RealignStack &&
           !AFI->isThumb1OnlyFunction() &&
+          AFI->hasStackFrame() &&
           (MFI->getMaxAlignment() > StackAlign) &&
           !MFI->hasVarSizedObjects());
 }