implement support for __builtin_eh_return_data_regno on x86-32 and x86-64.
This implements PR5034 and rdar://6836445.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@82614 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/Sema.h b/lib/Sema/Sema.h
index 193d992..875da1a 100644
--- a/lib/Sema/Sema.h
+++ b/lib/Sema/Sema.h
@@ -3700,6 +3700,7 @@
   bool SemaBuiltinObjectSize(CallExpr *TheCall);
   bool SemaBuiltinLongjmp(CallExpr *TheCall);
   bool SemaBuiltinAtomicOverloaded(CallExpr *TheCall);
+  bool SemaBuiltinEHReturnDataRegNo(CallExpr *TheCall);
   bool SemaCheckStringLiteral(const Expr *E, const CallExpr *TheCall,
                               bool HasVAListArg, unsigned format_idx,
                               unsigned firstDataArg);