Merging r367929:

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r367929 | echristo | 2019-08-05 23:25:59 +0200 (Mon, 05 Aug 2019) | 5 lines

BMI2 support is indicated in bit eight of EBX, not nine.
See Intel SDM, Vol 2A, Table 3-8:
https://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-vol-2a-manual.pdf#page=296

Differential Revision: https://reviews.llvm.org/D65766
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llvm-svn: 367996