[strong] Check super constructor calls

src/messages.js

Index: src/messages.js
diff --git a/src/messages.js b/src/messages.js
index f0e71d9578db50cdd27eb56e3ab9db3b4d3653aa..4132e2b7f27a66d6fa119304e61514aef4d614f6 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -170,6 +170,9 @@ var kMessages = {
   strong_for_in:                 ["Please don't use 'for'-'in' loops in strong mode, use 'for'-'of' instead"],
   strong_empty:                  ["Please don't use empty sub-statements in strong mode, make them explicit with '{}' instead"],
   strong_use_before_declaration: ["Please declare variable '", "%0", "' before use in strong mode"],
+  strong_super_call_missing:     ["Please always invoke the super constructor in subclasses in strong mode"],

[Dmitry Lomov (no reviews), 2015/03/13 16:41:04]

Do we need to plead here?

+  strong_super_call_duplicate:   ["Please don't invoke the super constructor multiple times in strong mode"],
+  strong_super_call_nested:      ["Please don't invoke the super constructor nested inside another statement or expression in strong mode"],
   sloppy_lexical:                ["Block-scoped declarations (let, const, function, class) not yet supported outside strict mode"],
   malformed_arrow_function_parameter_list: ["Malformed arrow function parameter list"],
   generator_poison_pill:         ["'caller' and 'arguments' properties may not be accessed on generator functions."],