[es6] Implement destructuring binding in try/catch

test/message/try-catch-lexical-conflict.js

Index: test/message/try-catch-lexical-conflict.js
diff --git a/test/mjsunit/harmony/regress/regress-517455.js b/test/message/try-catch-lexical-conflict.js
similarity index 81%
copy from test/mjsunit/harmony/regress/regress-517455.js
copy to test/message/try-catch-lexical-conflict.js
index a59fa181b7aac448df06f2ec0b5c90f32c048981..efb1ec7e015be38b408cfc877576151393154e0d 100644
--- a/test/mjsunit/harmony/regress/regress-517455.js
+++ b/test/message/try-catch-lexical-conflict.js
@@ -4,5 +4,8 @@
 //
 // Flags: --harmony-destructuring
 
-function f({x = ""}) { eval(x) }
-f({})
+"use strict";
+try {
+} catch ({x}) {
+  let x;
+}