Remove Scope::scope_uses_arguments_ flag

Remove Scope::scope_uses_arguments_ flag

Use of arguments is tracked as a variable, like any other variable.

R=arv@chromium.org
LOG=N
BUG=

Committed: https://crrev.com/d4ea33f480243fb5b7d2cca6edddcaa3e9478e29
Cr-Commit-Position: refs/heads/master@{#28271}

[arv (Not doing code reviews), 2015-05-06 15:39:03]

LGTM

[wingo, 2015-05-06 15:53:36]

The CQ bit was checked by wingo@igalia.com

[commit-bot: I haz the power, 2015-05-06 15:53:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1124233002/1

[commit-bot: I haz the power, 2015-05-06 16:25:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-06 16:25:33]

Patchset 1 (id:??) landed as
https://crrev.com/d4ea33f480243fb5b7d2cca6edddcaa3e9478e29
Cr-Commit-Position: refs/heads/master@{#28271}

[Michael Achenbach, 2015-05-07 07:41:59]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1134453002/ by machenbach@chromium.org.

The reason for reverting is: [Sheriff] Need to fix compilation after this
revert:
https://chromium.googlesource.com/v8/v8/+/5cab6be83a44567a3ee5747d728a399025d....