-inline-asm][X86] Add ability to use AVX512 in MS inline asm

Defined the new AVX512 registers in clang inline asm.
Fixed a bug in the MC subtarget info creation during the parsing of MS asm statement - now it receives the actual CPU and target features information.

Differential Revision: http://reviews.llvm.org/D16757



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@259639 91177308-0d34-0410-b5e6-96231b3b80d8