8265691: Some Object constructor methods aren't ES6 compliant

[szegedi]

Object constructor methods freeze, isFrozen, seal, isSealed, preventExtensions, isExtensible, getOwnPropertyNames, getOwnPropertySymbols operate under ES5 semantics even under ES6 language when their argument is not an object.

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Progress

• Change must not contain extraneous whitespace
• Change must be properly reviewed

Issue

• JDK-8265691: Some Object constructor methods aren't ES6 compliant

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/nashorn pull/14/head:pull/14
$ git checkout pull/14

Update a local copy of the PR:
$ git checkout pull/14
$ git pull https://git.openjdk.java.net/nashorn pull/14/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 14

View PR using the GUI difftool:
$ git pr show -t 14

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/nashorn/pull/14.diff

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