Convert a big bunch of expression parsers to use smart pointers.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@60906 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/Parser.cpp b/lib/Parse/Parser.cpp
index cf512ad..1cd7c0e 100644
--- a/lib/Parse/Parser.cpp
+++ b/lib/Parse/Parser.cpp
@@ -669,7 +669,7 @@
     return ExprError();
   }
 
-  OwningExprResult Res(Actions, ParseStringLiteralExpression());
+  OwningExprResult Res(ParseStringLiteralExpression());
   if (Res.isInvalid()) return move(Res);
 
   // TODO: Diagnose: wide string literal in 'asm'