Fix Issue 12136 - [AA] Associative array `keys` and `values` become non-properties.

Issue URL: https://d.puremagic.com/issues/show_bug.cgi?id=12136
Merge pull request #722 from denis-sh/fix-issue-12136

Fix Issue 12136 - [AA] Associative array `keys` and `values` become non-properties.