Previously, Object.values() and Object.entries() were piggy-backing on
Object.keys(). This meant that they would pre-filter non-enumerable properties,
violating the runtime behaviour of the methods. Unfortunately, this does not
match the current proposal text.

Also incorporates several tests verifying this behaviour based on tests included
in the ChakraCore implementation.

In this reland, the new patch fills up the longer-lasting FixedArray with
`undefined` to avoid the crash in Heap::Verify().

Originally reviewed at https://codereview.chromium.org/1637753004

BUG=v8:4663
LOG=N
R=adamk@chromium.org, rossberg@chromium.org, littledan@chromium.org

Review URL: https://codereview.chromium.org/1673673002

Cr-Commit-Position: refs/heads/master@{#33818}

Revert of [es7] refactor and fix Object.values() / Object.entries() (patchset #6 id:100001 of https://codereview.chromium.org/1637753004/ )

Reason for revert:
[Sheriff] Breaks gc stress:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20gc%20stress/builds/1642

Original issue's description:
> [es7] refactor and fix Object.values() / Object.entries()
>
> Previously, Object.values() and Object.entries() were piggy-backing on
> Object.keys(). This meant that they would pre-filter non-enumerable properties,
> violating the runtime behaviour of the methods. Unfortunately, this does not
> match the current proposal text.
>
> Also incorporates several tests verifying this behaviour based on tests included
> in the ChakraCore implementation.
>
> BUG=v8:4663
> LOG=N
> R=adamk@chromium.org, rossberg@chromium.org, littledan@chromium.org
>
> Committed: https://crrev.com/5c5ccd9d7f8693990d1a9eb26ba3a94f376dcf0b
> Cr-Commit-Position: refs/heads/master@{#33782}

TBR=littledan@chromium.org,adamk@chromium.org,cbruni@chromium.org,rossberg@chromium.org,caitpotter88@gmail.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4663

Review URL: https://codereview.chromium.org/1675663002

Cr-Commit-Position: refs/heads/master@{#33787}

Previously, Object.values() and Object.entries() were piggy-backing on
Object.keys(). This meant that they would pre-filter non-enumerable properties,
violating the runtime behaviour of the methods. Unfortunately, this does not
match the current proposal text.

Also incorporates several tests verifying this behaviour based on tests included
in the ChakraCore implementation.

BUG=v8:4663
LOG=N
R=adamk@chromium.org, rossberg@chromium.org, littledan@chromium.org

Review URL: https://codereview.chromium.org/1637753004

Cr-Commit-Position: refs/heads/master@{#33782}

BUG=v8:4663
LOG=N
TBR=hpayer@chromium.org
R=ljharb@gmail.com, rossberg@chromium.org, adamk@chromium.org

Review URL: https://codereview.chromium.org/1581033002

Cr-Commit-Position: refs/heads/master@{#33450}