[PATCH] [complex] Teach the complex math IR gen to emit direct math and a NaN-test prior to the call to the library function.

[Chandler Carruth]

Hi hfinkel, scanon, resistor,

This should automatically make fastmath (including just non-NaNs) able to avoid
the expensive libcalls and also open the door to more advanced folding in LLVM
based on the rules for complex math.

http://reviews.llvm.org/D5756

Files:
  lib/CodeGen/CGExprComplex.cpp
  test/CodeGen/complex-math.c
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