Revert of Optimize add/set/delete operations for string keys in Maps and Sets

Revert of Optimize add/set/delete operations for string keys in Maps and Sets (patchset #1 id:1 of https://codereview.chromium.org/777663003/)

Reason for revert:
Deopt fuzzer reports that something's still broken, reverting until
I can create a minimal repro.

Original issue's description:
> Optimize add/set/delete operations for string keys in Maps and Sets
> 
> This was previously landed in commit 66e2f60, but failed the
> collections mjsunit test with --deopt-every-n=1 due to a typo
> in the shrinking code. This patch corrects and simplifies the
> shrinking logic, and the tests now pass.
> 
> R=dslomov@chromium.org
> 
> Committed: https://chromium.googlesource.com/v8/v8/+/8599f5f047b4400f7f61de9e449b2246c9aad471

TBR=dslomov@chromium.org
NOTREECHECKS=true
NOTRY=true

[adamk, 2014-12-05 22:24:17]

Created Revert of Optimize add/set/delete operations for string keys in Maps and
Sets

[commit-bot: I haz the power, 2014-12-05 22:24:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/742353006/1

[commit-bot: I haz the power, 2014-12-05 22:25:08]

Committed patchset #1 (id:1)

[adamk, 2014-12-05 22:31:13]

Note: this time the failure was on ia32, but still reproduceable.