More tweaks to get the size of the X86 disassembler tables down.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150167 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/Disassembler/X86DisassemblerDecoderCommon.h b/lib/Target/X86/Disassembler/X86DisassemblerDecoderCommon.h
index a7ef0cc..d6b23c0 100644
--- a/lib/Target/X86/Disassembler/X86DisassemblerDecoderCommon.h
+++ b/lib/Target/X86/Disassembler/X86DisassemblerDecoderCommon.h
@@ -156,6 +156,8 @@
  * MODRM_SPLITRM  - If the ModR/M byte is between 0x00 and 0xbf, the opcode
  *                  corresponds to one instruction; otherwise, it corresponds to
  *                  a different instruction.
+ * MODRM_SPLITREG - ModR/M byte divided by 8 is used to select instruction. This
+                    corresponds to instructions that use reg field as opcode
  * MODRM_FULL     - Potentially, each value of the ModR/M byte could correspond
  *                  to a different instruction.
  */
@@ -163,6 +165,7 @@
 #define MODRMTYPES            \
   ENUM_ENTRY(MODRM_ONEENTRY)  \
   ENUM_ENTRY(MODRM_SPLITRM)   \
+  ENUM_ENTRY(MODRM_SPLITREG)  \
   ENUM_ENTRY(MODRM_FULL)
 
 #define ENUM_ENTRY(n) n,