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

[Matt Arsenault]

  Rewrite to use new cast helper functions. These will try to use a bitcast if the sizes are equal, and use trunc/zext/sext/prttoint/inttoptr if they are not. It will not use the floating point casts.

Hi baldrick,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1058?vs=2601&id=3044#toc

Files:
  include/llvm/IR/InstrTypes.h
  lib/IR/Instructions.cpp
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/Transforms/InstCombine/bitcast-alias-function.ll
  unittests/IR/InstructionsTest.cpp
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