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#1613 — step 7 can fail silently if non-configurable "prototype" already present

Step 7 of (MakeConstructor) can fail silently if the `F` object already has a non-configurable "prototype" property. Maybe this is also place where DefinePropertyOrThrow() needs to be used, but I'm not 100% this time.

test case:
class MyFunction extends Function {
constructor(...args) {
Object.defineProperty(this, "prototype", {value: 0});

var fn = new MyFunction("");

print(fn.prototype); // prints 0

this should never occur. Added an appropriate assertion.

Fixed in rev17 editor's draft

fixed in rev17, August 23, 2013 draft