Merge pull request swiftlang#38845 from xedin/fix-closure-solution-application

[CSClosure] Use rewritten expression when applying solution to a brac…

Author: xedin

lib/Sema/CSClosure.cpp

@@ -181,7 +181,7 @@ class ClosureConstraintApplication
       if (auto expr = node.dyn_cast<Expr *>()) {
         // Rewrite the expression.
         if (auto rewrittenExpr = rewriteExpr(expr))
-          node = expr;
+          node = rewrittenExpr;
         else
           hadError = true;
       } else if (auto stmt = node.dyn_cast<Stmt *>()) {