Details:
- Replaced direct usage of _Pragma( "omp simd" ) in reference kernels
with PRAGMA_SIMD, which is defined as a function of the compiler being
used in a new bli_pragma_macro_defs.h file. That definition is cleared
when BLIS detects that the -fopenmp-simd command line option is
unsupported. Thanks to Devin Matthews and Jeff Hammond for suggestions
that guided this commit.
- Updated configure and bli_config.h.in so that the appropriate anchor
is substituted in (when the corresponding pragma omp simd support is
present).
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