Revert of [builtins] DeleteProperty: Handle last-added fast properties

Revert of [builtins] DeleteProperty: Handle last-added fast properties (patchset #2 id:20001 of https://codereview.chromium.org/2830093002/ )

Reason for revert:
Breaks: 
https://build.chromium.org/p/client.v8/builders/V8%20Mac%20GC%20Stress/builds/12920
and
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20gc%20stress/builds/10281

Original issue's description:
> [builtins] DeleteProperty: Handle last-added fast properties
> 
> In general, deleting a property from a fast-properties object
> requires transitioning the object to dictionary mode. However,
> when the most-recently-added property is deleted, we can simply
> roll back the last map transition that the object went through.
> 
> This is a performance experiment: it should make things faster,
> but if it turns out to have more negative than positive impact,
> we will have to revert it.
> 
> TBR=bmeurer@chromium.org (just adding a comment)
> 
> Review-Url: https://codereview.chromium.org/2830093002
> Cr-Commit-Position: refs/heads/master@{#44799}
> Committed: https://chromium.googlesource.com/v8/v8/+/98acfb36e1acf2ab52ab6b6439eb6356c83dcda6

TBR=ishell@chromium.org,jkummerow@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2843473002
Cr-Commit-Position: refs/heads/master@{#44806}
Committed: https://chromium.googlesource.com/v8/v8/+/852a20b08c031690db262e257f87d0bb664a86ea

[Michael Achenbach, 2017-04-24 14:52:39]

The CQ bit was checked by machenbach@chromium.org

[Michael Achenbach, 2017-04-24 14:52:39]

Created Revert of [builtins] DeleteProperty: Handle last-added fast properties

[commit-bot: I haz the power, 2017-04-24 14:52:49]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-24 14:52:57]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493045559002590, "parent_rev":
"7f7d445ff6ee0d11e7ba66d20cea402052c6d3b4", "commit_rev":
"852a20b08c031690db262e257f87d0bb664a86ea"}

[commit-bot: I haz the power, 2017-04-24 14:53:03]

Description was changed from

==========
Revert of [builtins] DeleteProperty: Handle last-added fast properties (patchset
#2 id:20001 of https://codereview.chromium.org/2830093002/ )

Reason for revert:
Breaks: 
https://build.chromium.org/p/client.v8/builders/V8%20Mac%20GC%20Stress/builds...
and
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20gc%20stress/...

Original issue's description:
> [builtins] DeleteProperty: Handle last-added fast properties
> 
> In general, deleting a property from a fast-properties object
> requires transitioning the object to dictionary mode. However,
> when the most-recently-added property is deleted, we can simply
> roll back the last map transition that the object went through.
> 
> This is a performance experiment: it should make things faster,
> but if it turns out to have more negative than positive impact,
> we will have to revert it.
> 
> TBR=bmeurer@chromium.org (just adding a comment)
> 
> Review-Url: https://codereview.chromium.org/2830093002
> Cr-Commit-Position: refs/heads/master@{#44799}
> Committed:
https://chromium.googlesource.com/v8/v8/+/98acfb36e1acf2ab52ab6b6439eb6356c83...

TBR=ishell@chromium.org,jkummerow@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Revert of [builtins] DeleteProperty: Handle last-added fast properties (patchset
#2 id:20001 of https://codereview.chromium.org/2830093002/ )

Reason for revert:
Breaks: 
https://build.chromium.org/p/client.v8/builders/V8%20Mac%20GC%20Stress/builds...
and
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20gc%20stress/...

Original issue's description:
> [builtins] DeleteProperty: Handle last-added fast properties
> 
> In general, deleting a property from a fast-properties object
> requires transitioning the object to dictionary mode. However,
> when the most-recently-added property is deleted, we can simply
> roll back the last map transition that the object went through.
> 
> This is a performance experiment: it should make things faster,
> but if it turns out to have more negative than positive impact,
> we will have to revert it.
> 
> TBR=bmeurer@chromium.org (just adding a comment)
> 
> Review-Url: https://codereview.chromium.org/2830093002
> Cr-Commit-Position: refs/heads/master@{#44799}
> Committed:
https://chromium.googlesource.com/v8/v8/+/98acfb36e1acf2ab52ab6b6439eb6356c83...

TBR=ishell@chromium.org,jkummerow@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2843473002
Cr-Commit-Position: refs/heads/master@{#44806}
Committed:
https://chromium.googlesource.com/v8/v8/+/852a20b08c031690db262e257f87d0bb664...
==========

[commit-bot: I haz the power, 2017-04-24 14:53:04]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/852a20b08c031690db262e257f87d0bb664...

[Jakob Kummerow, 2017-04-24 15:05:23]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2840583002/ by jkummerow@chromium.org.

The reason for reverting is: relanding with fix.