Add the initial TypoExpr AST node for delayed typo correction.

llvm-svn: 220692
diff --git a/clang/lib/Sema/SemaExceptionSpec.cpp b/clang/lib/Sema/SemaExceptionSpec.cpp
index e4963b1..ac0616d 100644
--- a/clang/lib/Sema/SemaExceptionSpec.cpp
+++ b/clang/lib/Sema/SemaExceptionSpec.cpp
@@ -1068,6 +1068,7 @@
   case Expr::UnaryExprOrTypeTraitExprClass:
   case Expr::UnresolvedLookupExprClass:
   case Expr::UnresolvedMemberExprClass:
+  case Expr::TypoExprClass:
     // FIXME: Can any of the above throw?  If so, when?
     return CT_Cannot;