Properties can be defined inside the object literal (ES6) or after
object creation. The behavior differes if there are accessors, interceptors
or proxies in the Object prototype chain.

These test cases assure we preserve correct behavior as we
improve performance of definitions in literals.

BUG=v8:5624

Review-Url: https://codereview.chromium.org/2501553002
Cr-Commit-Position: refs/heads/master@{#41024}