[X86] Move the AC_EVEX_2_VEX AsmComments enum to X86InstrInfo.h from X86InstComments.h.

X86InstComments.h is used by tools that only have the MC layer. We shouldn't be importing a file from CodeGen into this.

X86InstrInfo.h isn't a great place, but I couldn't find a better one.

llvm-svn: 327202
diff --git a/llvm/lib/Target/X86/X86EvexToVex.cpp b/llvm/lib/Target/X86/X86EvexToVex.cpp
index c9d9369..c1d8086 100644
--- a/llvm/lib/Target/X86/X86EvexToVex.cpp
+++ b/llvm/lib/Target/X86/X86EvexToVex.cpp
@@ -288,7 +288,7 @@
     return false;
 
   MI.setDesc(TII->get(NewOpc));
-  MI.setAsmPrinterFlag(AC_EVEX_2_VEX);
+  MI.setAsmPrinterFlag(X86::AC_EVEX_2_VEX);
   return true;
 }