Parsing/AST support for Structured Exception Handling

Patch authored by Sohail Somani.

Provide parsing and AST support for Windows structured exception handling.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@130366 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/TokenLexer.cpp b/lib/Lex/TokenLexer.cpp
index f1e1596..65aff0d 100644
--- a/lib/Lex/TokenLexer.cpp
+++ b/lib/Lex/TokenLexer.cpp
@@ -367,11 +367,7 @@
     // won't be handled by Preprocessor::HandleIdentifier because this is coming
     // from a macro expansion.
     if (II->isPoisoned() && TokenIsFromPaste) {
-      // We warn about __VA_ARGS__ with poisoning.
-      if (II->isStr("__VA_ARGS__"))
-        PP.Diag(Tok, diag::ext_pp_bad_vaargs_use);
-      else
-        PP.Diag(Tok, diag::err_pp_used_poisoned_id);
+      PP.HandlePoisonedIdentifier(Tok);
     }
 
     if (!DisableMacroExpansion && II->isHandleIdentifierCase())