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/MIRParser/MIParser.cpp b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
index f49b524..2675254 100644
--- a/llvm/lib/CodeGen/MIRParser/MIParser.cpp
+++ b/llvm/lib/CodeGen/MIRParser/MIParser.cpp
@@ -1154,7 +1154,7 @@
                  "'");
   StringRef Name;
   if (const auto *Alloca =
-          MF.getFrameInfo()->getObjectAllocation(ObjectInfo->second))
+          MF.getFrameInfo().getObjectAllocation(ObjectInfo->second))
     Name = Alloca->getName();
   if (!Token.stringValue().empty() && Token.stringValue() != Name)
     return error(Twine("the name of the stack object '%stack.") + Twine(ID) +