Web Inspector: Avoid getOwnPropertyNames/Symbols on very large lists

[Joseph Pecoraro]

* SUMMARY
Avoid getOwnPropertyNames/Symbols on very large lists.

Note that better handling of large lists in general should be handled by:
<https://webkit.org/b/143589> Web Inspector: Better handling for large collections in Object Trees

For now, lets not hang / out of memory trying to build a list of all the property names in a multi-million element list.

* STEPS TO REPRODUCE
1. js> var buffer = new ArrayBuffer(10000000); var int8View = new Int8Array(buffer); int8View
  => hang (Web Content Process's memory grows, attempting to get property names for a preview)
2. js> var buffer = new ArrayBuffer(10000000); var int8View = new Int8Array(buffer);
3. Type: "int8View."
  => hang (Web Content Process's memory grows, attempting to get property names for autocompletion)

[Joseph Pecoraro]

<rdar://problem/21233251>

[Joseph Pecoraro]

Created attachment 255175 [details]
[PATCH] Proposed Fix

[WebKit Commit Bot]

Comment on attachment 255175 [details]
[PATCH] Proposed Fix

Clearing flags on attachment: 255175

Committed r185741: <http://trac.webkit.org/changeset/185741>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.