Adding -mtbm and -mno-tbm command line options to the clang front end for the
x86 TBM instruction set. Also adding a __TBM__ macro if the TBM feature is
enabled. Otherwise there should be no functionality change to existing features.

Phabricator code review is located here: http://llvm-reviews.chandlerc.com/D1693



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191326 91177308-0d34-0410-b5e6-96231b3b80d8