Revert "[heap] No leakage of mark-compact.h outside of heap."

Revert "[heap] No leakage of mark-compact.h outside of heap."

The change in question caused regressions on GC-heavy benchmarks,
presumably due to the added indirection that is taken within hot code
like the marking visitor.

This is a manual revert due to conflicts.

This reverts commit 4f55b83012247148e7040771bdcfccaea352201a.

R=hpayer@chromium.org
BUG=chromium:539273
LOG=n

Committed: https://crrev.com/871529b4d86c406b4139129f138d88177a728a09
Cr-Commit-Position: refs/heads/master@{#31097}

[Hannes Payer (out of office), 2015-10-05 08:46:10]

lgtm

[Michael Starzinger, 2015-10-05 12:11:38]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-10-05 12:11:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1386863002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1386863002/1

[commit-bot: I haz the power, 2015-10-05 12:14:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-05 12:14:21]

Patchset 1 (id:??) landed as
https://crrev.com/871529b4d86c406b4139129f138d88177a728a09
Cr-Commit-Position: refs/heads/master@{#31097}