Add XTEST intrinsic defined in TSX extension



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@178330 91177308-0d34-0410-b5e6-96231b3b80d8
Add RDSEED intrinsic support defined in AVX2 extension



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@178331 91177308-0d34-0410-b5e6-96231b3b80d8