[PATCH] First stage of call lowering for Mips fast-isel

[reed kotler]

Add the test case for this putback and do some small cleanup of the code.
Still more review to do. It's not ready to push upstream yet.

http://reviews.llvm.org/D5714

Files:
  lib/Target/Mips/MipsCallingConv.td
  lib/Target/Mips/MipsFastISel.cpp
  lib/Target/Mips/MipsISelLowering.cpp
  lib/Target/Mips/MipsISelLowering.h
  test/CodeGen/Mips/Fast-ISel/callabi.ll
  test/CodeGen/Mips/Fast-ISel/icmpa.ll
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