Constructors of ES classes require `new` but the runtime doesn't check it

[teppeis]

In ES2015+, calling constructors of classes and builtin classes (Map, Set, WeakMap and WeakSet) without new throws TypeError.

Map(); // throws `TypeError`

https://www.ecma-international.org/ecma-262/6.0/#sec-map-iterable

In Closure Compiler ADVANCED mode, JSC_CONSTRUCTOR_NOT_CALLABLE warning is correctly thrown in compile time.
But in SIMPLE or WHITESPACE_ONLY mode, no warnings are detected in compile time and the runtime doesn't throw any errors.

Should the polyfill runtime of Closure Compiler for the constructors throw runtime error for SIMPLE and WHITESPACE_ONLY mode?

I will send a PR if necessary.