[cleanup] Minor cleanups concerning assemblers and code generation.

[cleanup] Minor cleanups concerning assemblers and code generation.

- Use Assembler in a few places that unneccessarily used MacroAssembler before.
- Fix some comments.

R=jarin@chromium.org
BUG=v8:6048
Review-Url: https://codereview.chromium.org/2843933002
Cr-Commit-Position: refs/heads/master@{#44894}
Committed: https://chromium.googlesource.com/v8/v8/+/86d2545f77b97b35ec9fe9b24ec80ad9b37bbca5

[Jarin, 2017-04-26 14:03:41]

lgtm, thanks!

[neis, 2017-04-26 14:04:49]

The CQ bit was checked by neis@chromium.org

[commit-bot: I haz the power, 2017-04-26 14:04:56]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-04-26 14:54:34]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493215489248300, "parent_rev":
"6b4b0624894ed91e4dcbf708431da78cadd83da8", "commit_rev":
"86d2545f77b97b35ec9fe9b24ec80ad9b37bbca5"}

[commit-bot: I haz the power, 2017-04-26 14:54:39]

Description was changed from

==========
[cleanup] Minor cleanups concerning assemblers and code generation.

- Use Assembler in a few places that unneccessarily used MacroAssembler before.
- Fix some comments.

R=jarin@chromium.org
BUG=v8:6048
==========

to

==========
[cleanup] Minor cleanups concerning assemblers and code generation.

- Use Assembler in a few places that unneccessarily used MacroAssembler before.
- Fix some comments.

R=jarin@chromium.org
BUG=v8:6048

Review-Url: https://codereview.chromium.org/2843933002
Cr-Commit-Position: refs/heads/master@{#44894}
Committed:
https://chromium.googlesource.com/v8/v8/+/86d2545f77b97b35ec9fe9b24ec80ad9b37...
==========

[commit-bot: I haz the power, 2017-04-26 14:54:40]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/86d2545f77b97b35ec9fe9b24ec80ad9b37...