[coroutines] Initial stub Sema functionality for handling coroutine await / yield / return.

llvm-svn: 250993
diff --git a/clang/lib/Parse/ParseExprCXX.cpp b/clang/lib/Parse/ParseExprCXX.cpp
index c3df773..bd9b9f9 100644
--- a/clang/lib/Parse/ParseExprCXX.cpp
+++ b/clang/lib/Parse/ParseExprCXX.cpp
@@ -1567,8 +1567,8 @@
 
   SourceLocation Loc = ConsumeToken();
   ExprResult Expr = ParseAssignmentExpression();
-  (void)Loc;
-  // FIXME: Pass to Sema.
+  if (!Expr.isInvalid())
+    Expr = Actions.ActOnCoyieldExpr(Loc, Expr.get());
   return Expr;
 }