Reland of Add errors for declarations which conflict with catch parameters.

test/mjsunit/es6/block-conflicts.js

Index: test/mjsunit/es6/block-conflicts.js
diff --git a/test/mjsunit/es6/block-conflicts.js b/test/mjsunit/es6/block-conflicts.js
index 0e3d4e5a2ae80ec861b6552022628afb7b249a01..bca3cb4ea545a9981b8cd75f0cefb242d3ed6171 100644
--- a/test/mjsunit/es6/block-conflicts.js
+++ b/test/mjsunit/es6/block-conflicts.js
@@ -170,8 +170,5 @@ for (var v = 0; v < varbinds.length; ++v) {
   TestNoConflict('(function (x) {' + varbinds[v] + '})();');
 }
 
-// Test conflicting catch/function bindings.
-TestNoConflict('try {} catch(x) {' + funbind + '}');
-
 // Test conflicting parameter/function bindings.
 TestNoConflict('(function (x) {' + funbind + '})();');