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Adding LLVM back-end support to two intrinsics dealing with bit scan: _bit_scan_forward and _bit_scan_reverse. Their functionality is as described in Intel intrinsics guide: https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_bit_scan_forward&expand=371,370 https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_bit_scan_reverse&expand=371,370 Commit on behalf of Omer Paparo Bivas Differential Revision: http://reviews.llvm.org/D19915 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@271386 91177308-0d34-0410-b5e6-96231b3b80d8