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

[reed kotler]

Fix some small changes requested by Daniel; handling of AExt as SExt, and call to llvm_unreachable if an attempt is made to use custom args, since we don't use them and hence don't expect that situation to occur.

http://reviews.llvm.org/D5714

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