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/Hexagon/HexagonVLIWPacketizer.cpp b/llvm/lib/Target/Hexagon/HexagonVLIWPacketizer.cpp
index ef87959..5bbda9b 100644
--- a/llvm/lib/Target/Hexagon/HexagonVLIWPacketizer.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonVLIWPacketizer.cpp
@@ -452,7 +452,7 @@
     default:
       llvm_unreachable("Unexpected instruction");
   }
-  unsigned FrameSize = MF.getFrameInfo()->getStackSize();
+  unsigned FrameSize = MF.getFrameInfo().getStackSize();
   MachineOperand &Off = MI->getOperand(1);
   int64_t NewOff = Off.getImm() - (FrameSize + HEXAGON_LRFP_SIZE);
   if (HII->isValidOffset(Opc, NewOff)) {
@@ -473,7 +473,7 @@
     default:
       llvm_unreachable("Unexpected instruction");
   }
-  unsigned FrameSize = MF.getFrameInfo()->getStackSize();
+  unsigned FrameSize = MF.getFrameInfo().getStackSize();
   MachineOperand &Off = MI->getOperand(1);
   Off.setImm(Off.getImm() + FrameSize + HEXAGON_LRFP_SIZE);
 }