[CLANG] [AVX512] [BUILTIN] Adding prol{d|q|w}{128|256|512} builtin to clang .
[CLANG] [AVX512] [BUILTIN] Adding prol{d|q|w}{128|256|512} builtin to clang .

Fixing problem with the lib/include/avx512vlintrin.h file. 
Adding one more _ to the prefix of _extension__ -> __extension__.

Differential Revision: http://reviews.llvm.org/D16985


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@261518 91177308-0d34-0410-b5e6-96231b3b80d8

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