[PATCH] Avoid FP conversions when calling bitcasted / alias functions

[Matt Arsenault]

Hi baldrick,

This patch is to address the problem I asked about here:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-May/062557.html

This tries to use bitcast on the function arguments / return value when the bit sizes match, rather than whatever CastInst::getCastOpcode decides to use. This is to avoid doing floating point conversions when casting to a function expecting an integer.

http://llvm-reviews.chandlerc.com/D1058

Files:
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/Transforms/InstCombine/bitcast-alias-function.ll
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