[mips] Move F128 argument handling into MipsCCState as we did for returns. NFC.

Summary:
There are a couple more changes to make before analyzeFormalArguments can
be merged into the standard AnalyzeFormalArguments. I've had to temporarily
poke a couple holes in MipsCCState's encapsulation to save having to make
all the required changes for this merge all at once*. These will be removed
shortly.

* We must merge our ByVal argument handling with the implementation in CCState.
  This will be done over the next three patches, then the fourth will merge
  analyzeFormalArguments with AnalyzeFormalArguments.

Depends on D5967

Reviewers: vmedic

Reviewed By: vmedic

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5969

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221056 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/MipsISelLowering.h

@@ -366,7 +366,6 @@ namespace llvm {
                                CCState &State);
       void analyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
                                   bool IsSoftFloat,
-                                  Function::const_arg_iterator FuncArg,
                                   CCState &State);
 
       /// hasByValArg - Returns true if function has byval arguments.