Reviewers: Toon Verwaest, ulan,

Message:
Created Revert of Fix memory leak caused by field type in descriptor array.

Description:
Revert of Fix memory leak caused by field type in descriptor array. (patchset #3
id:40001 of https://codereview.chromium.org/955063002/)

Reason for revert:
Breaks test/mjsunit/debug-clearbreakpointgroup.js on arm64.debug.

Original issue's description:
Fix memory leak caused by field type in descriptor array.

When a field type is a map, it is wrapped in a weak cell upon storing to the
descriptor array.

Map::GetFieldType(i) does the unwrapping.

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

Committed: https://crrev.com/77d3ae0e119893ac8d34ea6ca090cddd5bbf987e
Cr-Commit-Position: refs/heads/master@{#26879}

[email protected],[email protected]
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:3877

Please review this at https://codereview.chromium.org/960103003/

Base URL: https://chromium.googlesource.com/v8/v8.git@master

Affected files (+28, -99 lines):
  M src/objects.h
  M src/objects.cc
  M src/objects-inl.h
  M src/property.h
  M test/cctest/test-heap.cc
  M test/cctest/test-migrations.cc


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