[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.

llvm-svn: 329049
diff --git a/llvm/utils/TableGen/X86RecognizableInstr.h b/llvm/utils/TableGen/X86RecognizableInstr.h
index 36579d0..75354c1 100644
--- a/llvm/utils/TableGen/X86RecognizableInstr.h
+++ b/llvm/utils/TableGen/X86RecognizableInstr.h
@@ -126,7 +126,7 @@
   };
 
   enum {
-    PS = 1, PD = 2, XS = 3, XD = 4
+    PD = 1, XS = 2, XD = 3, PS = 4
   };
 
   enum {