LLVM/Clang 3.2 SVN Compiler Performance

At least for the HWB Color Space test, there was no performance drop out of GraphicsMagick when using corei7-avx optimizations on the latest LLVM/Clang development code.

The Local Adaptive Thresholding operation was negatively affected by LLVM/Clang 3.2 when using corei7-avx support.

The Himeno Poisson Pressure Solver results were virtually unchanged.

There wasn't any measurable difference in the compilation time of LLVM/Clang 3.2 for either CPU target, at least when building the common PHP package.