Revert "Revert of Fix memory leak caused by field type in descriptor array."

Revert "Revert of Fix memory leak caused by field type in descriptor array."

This reverts commit b57be748b175695be2507cedf3423b59b9d6cd20 and
disables the test/mjsunit/debug-clearbreakpointgroup.js because
BreakLocationIterator::ClearBreakPoint is already broken for unrelated reasons (see v8:3924).

BUG=v8:3877
LOG=N
TEST=cctest/test-heap/Regress3877

Committed: https://crrev.com/bbf8c0f23d4995da2a9273e8aed818905f791167
Cr-Commit-Position: refs/heads/master@{#26893}

[ulan, 2015-02-26 15:57:42]

ulan@chromium.org changed reviewers:
+ marja@chromium.org

[ulan, 2015-02-26 15:57:42]

PTAL

[marja, 2015-02-26 16:06:01]

lgtm

[ulan, 2015-02-26 16:06:13]

The CQ bit was checked by ulan@chromium.org

[commit-bot: I haz the power, 2015-02-26 16:06:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/957373002/20001

[commit-bot: I haz the power, 2015-02-26 18:38:29]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-26 18:38:43]

Patchset 2 (id:??) landed as
https://crrev.com/bbf8c0f23d4995da2a9273e8aed818905f791167
Cr-Commit-Position: refs/heads/master@{#26893}

[Yang, 2015-03-19 07:05:12]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/1023503003/ by yangguo@chromium.org.

The reason for reverting is: GC Stress breakage..