[PATCH] [OPENMP] -fopenmp enables OpenMP support (fix for http://llvm.org/PR23492)

[Alexey Bataev]

Hi chandlerc, rsmith,

-fopenmp turns on OpenMP support and links libiomp5 as OpenMP library. Also there is -fopenmp={libiomp5|libgomp} option that allows to override effect of -fopenmp and link libgomp library (if -fopenmp=libgomp is specified).

http://reviews.llvm.org/D9736

Files:
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/OpenMP/linking.c
  test/OpenMP/openmp_common.c
  test/OpenMP/predefined_macro.c

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