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/Mips/MipsFastISel.cpp b/llvm/lib/Target/Mips/MipsFastISel.cpp
index 19c201d..26b5c43 100644
--- a/llvm/lib/Target/Mips/MipsFastISel.cpp
+++ b/llvm/lib/Target/Mips/MipsFastISel.cpp
@@ -762,7 +762,7 @@
     unsigned FI = Addr.getFI();
     unsigned Align = 4;
     unsigned Offset = Addr.getOffset();
-    MachineFrameInfo &MFI = *MF->getFrameInfo();
+    MachineFrameInfo &MFI = MF->getFrameInfo();
     MachineMemOperand *MMO = MF->getMachineMemOperand(
         MachinePointerInfo::getFixedStack(*MF, FI), MachineMemOperand::MOLoad,
         MFI.getObjectSize(FI), Align);
@@ -813,7 +813,7 @@
     unsigned FI = Addr.getFI();
     unsigned Align = 4;
     unsigned Offset = Addr.getOffset();
-    MachineFrameInfo &MFI = *MF->getFrameInfo();
+    MachineFrameInfo &MFI = MF->getFrameInfo();
     MachineMemOperand *MMO = MF->getMachineMemOperand(
         MachinePointerInfo::getFixedStack(*MF, FI), MachineMemOperand::MOStore,
         MFI.getObjectSize(FI), Align);