[PATCH] [mips][FastISel] Handle functions which return i1, i8 or i16.

[Vasileios Kalintiris]

Added a testcase and modified the patch to handle ret values for i1/i8/i16
when they don't require sign/zero extension.


http://reviews.llvm.org/D6765

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

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