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

[Matt Arsenault]

  Only allow bitcasts. Change the tests that were checking for the ext / trunc / pointer <-> int conversions.

Hi baldrick,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1058?vs=3045&id=3056#toc

Files:
  include/llvm/IR/InstrTypes.h
  lib/IR/Instructions.cpp
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/Transforms/InstCombine/2008-01-06-BitCastAttributes.ll
  test/Transforms/InstCombine/2008-01-06-VoidCast.ll
  test/Transforms/InstCombine/apint-call-cast-target.ll
  test/Transforms/InstCombine/bitcast-alias-function.ll
  test/Transforms/InstCombine/call-cast-target.ll
  test/Transforms/InstCombine/call.ll
  unittests/IR/InstructionsTest.cpp
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