[CodeGen] Pass references, not pointers, to MMI helpers. NFC.

While there, rename them to follow the coding style.

llvm-svn: 287169
diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
index 452bb05..cf5803b 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -1066,7 +1066,7 @@
   }
 
   MachineModuleInfo &MMI = FuncInfo.MF->getMMI();
-  ComputeUsesVAFloatArgument(*Call, &MMI);
+  computeUsesVAFloatArgument(*Call, MMI);
 
   // Handle intrinsic function calls.
   if (const auto *II = dyn_cast<IntrinsicInst>(Call))