MachineFunction: Return reference for getFrameInfo(); NFC

getFrameInfo() never returns nullptr so we should use a reference
instead of a pointer.

llvm-svn: 277017
diff --git a/llvm/lib/Target/X86/X86InstrInfo.cpp b/llvm/lib/Target/X86/X86InstrInfo.cpp
index 74b9ae3..aca28c9 100644
--- a/llvm/lib/Target/X86/X86InstrInfo.cpp
+++ b/llvm/lib/Target/X86/X86InstrInfo.cpp
@@ -4985,7 +4985,7 @@
                                        const TargetRegisterClass *RC,
                                        const TargetRegisterInfo *TRI) const {
   const MachineFunction &MF = *MBB.getParent();
-  assert(MF.getFrameInfo()->getObjectSize(FrameIdx) >= RC->getSize() &&
+  assert(MF.getFrameInfo().getObjectSize(FrameIdx) >= RC->getSize() &&
          "Stack slot too small for store");
   unsigned Alignment = std::max<uint32_t>(RC->getSize(), 16);
   bool isAligned =
@@ -6346,9 +6346,9 @@
   if (!MF.getFunction()->optForSize() && hasPartialRegUpdate(MI.getOpcode()))
     return nullptr;
 
-  const MachineFrameInfo *MFI = MF.getFrameInfo();
-  unsigned Size = MFI->getObjectSize(FrameIndex);
-  unsigned Alignment = MFI->getObjectAlignment(FrameIndex);
+  const MachineFrameInfo &MFI = MF.getFrameInfo();
+  unsigned Size = MFI.getObjectSize(FrameIndex);
+  unsigned Alignment = MFI.getObjectAlignment(FrameIndex);
   // If the function stack isn't realigned we don't want to fold instructions
   // that need increased alignment.
   if (!RI.needsStackRealignment(MF))