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/InlineSpiller.cpp b/llvm/lib/CodeGen/InlineSpiller.cpp
index 197db77..9aa58af 100644
--- a/llvm/lib/CodeGen/InlineSpiller.cpp
+++ b/llvm/lib/CodeGen/InlineSpiller.cpp
@@ -114,7 +114,7 @@
         AA(&pass.getAnalysis<AAResultsWrapperPass>().getAAResults()),
         MDT(pass.getAnalysis<MachineDominatorTree>()),
         Loops(pass.getAnalysis<MachineLoopInfo>()), VRM(vrm),
-        MFI(*mf.getFrameInfo()), MRI(mf.getRegInfo()),
+        MFI(mf.getFrameInfo()), MRI(mf.getRegInfo()),
         TII(*mf.getSubtarget().getInstrInfo()),
         TRI(*mf.getSubtarget().getRegisterInfo()),
         MBFI(pass.getAnalysis<MachineBlockFrequencyInfo>()),
@@ -172,7 +172,7 @@
         AA(&pass.getAnalysis<AAResultsWrapperPass>().getAAResults()),
         MDT(pass.getAnalysis<MachineDominatorTree>()),
         Loops(pass.getAnalysis<MachineLoopInfo>()), VRM(vrm),
-        MFI(*mf.getFrameInfo()), MRI(mf.getRegInfo()),
+        MFI(mf.getFrameInfo()), MRI(mf.getRegInfo()),
         TII(*mf.getSubtarget().getInstrInfo()),
         TRI(*mf.getSubtarget().getRegisterInfo()),
         MBFI(pass.getAnalysis<MachineBlockFrequencyInfo>()),