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[AVX512] adding AVXVBMI feature flag

Authored by m_zuckerman on Jan 17 2016, 5:42 AM.

Description

[AVX512] adding AVXVBMI feature flag

The feature flag is for VPERMB,VPERMI2B,VPERMT2B and VPMULTISHIFTQB instructions.
More about the instruction can be found in:
hattps://software.intel.com/sites/default/files/managed/07/b7/319433-023.pdf

Differential Revision: http://reviews.llvm.org/D16190

llvm-svn: 258012