[X86] Reduce number of OpPrefix bits in TSFlags to 2. NFCI

TSFlag doesn't need to disambiguate NoPrfx from PS. So shift the encodings so PS is NoPrfx|0x4.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@329049 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed