AsmParser: Give a nice error message for .code16gcc, which is currently unsupported.

Patch by Team PaX!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156708 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index 80e101f..8ac0fd2 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -1257,7 +1257,7 @@
     if (IDVal == ".incbin")
       return ParseDirectiveIncbin();
 
-    if (IDVal == ".code16")
+    if (IDVal == ".code16" || IDVal == ".code16gcc")
       return TokError(Twine(IDVal) + " not supported yet");
 
     // Look up the handler in the handler table.