This CL is just a rebase of the original CL
(https://codereview.chromium.org/2150523002).

The reason for reverting was: Dependency of the roll unblocking revert
https://codereview.chromium.org/2147883003/.

Original message:
The self reference requires the allocation of a handle in the macro
assembler, which is not possible if we instantiate the macro assembler
in a worker thread.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2151493002
Cr-Commit-Position: refs/heads/master@{#37744}