MachineFunction: Return reference from getFunction(); NFC

The Function can never be nullptr so we can return a reference.

llvm-svn: 320884
diff --git a/llvm/lib/Target/X86/X86OptimizeLEAs.cpp b/llvm/lib/Target/X86/X86OptimizeLEAs.cpp
index 0b77014..1fc6f07 100644
--- a/llvm/lib/Target/X86/X86OptimizeLEAs.cpp
+++ b/llvm/lib/Target/X86/X86OptimizeLEAs.cpp
@@ -672,7 +672,7 @@
 bool OptimizeLEAPass::runOnMachineFunction(MachineFunction &MF) {
   bool Changed = false;
 
-  if (DisableX86LEAOpt || skipFunction(*MF.getFunction()))
+  if (DisableX86LEAOpt || skipFunction(MF.getFunction()))
     return false;
 
   MRI = &MF.getRegInfo();
@@ -696,7 +696,7 @@
 
     // Remove redundant address calculations. Do it only for -Os/-Oz since only
     // a code size gain is expected from this part of the pass.
-    if (MF.getFunction()->optForSize())
+    if (MF.getFunction().optForSize())
       Changed |= removeRedundantAddrCalc(LEAs);
   }