[PATCH] [OpenMP] Make default OpenMP library (the one selected with just -fopenmp) configurable in the CMake build. There shouldn't be any change in default behavior.

[Richard Smith]

I switched to specifying a library name in `OPENMP_DEFAULT_LIB` (to support cases where people ship libiomp5 under a different name) and commited as r237850.


http://reviews.llvm.org/D9878

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