[PATCH] Beginning of alloca implementation for Mips fast-isel

[reed kotler]

Fix a bug for this push for when offsets do not fit in the 16 bit signed offset.
I would have put this in a separate patch but the patch needs some of the new features in this
patch; otherwise it would have to be rewritten for this patch.

http://reviews.llvm.org/D6426

Files:
  lib/Target/Mips/MipsFastISel.cpp
  test/CodeGen/Mips/Fast-ISel/overflt.ll
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