Separate x86 opcode maps and 0x66/0xf2/0xf3 prefixes from each other in the TSFlags. This greatly simplifies the switch statements in the disassembler tables and the code emitters.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200522 91177308-0d34-0410-b5e6-96231b3b80d8