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/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
index 6d3fe8c..25b246d 100644
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -1177,7 +1177,7 @@
                                    MachineBasicBlock *MBB) const {
   MachineInstr *MI = &InitialMI;
   MachineFunction &MF = *MI->getParent()->getParent();
-  MachineFrameInfo &MFI = *MF.getFrameInfo();
+  MachineFrameInfo &MFI = MF.getFrameInfo();
 
   // We're handling multiple types of operands here:
   // PATCHPOINT MetaArgs - live-in, read only, direct