[turbofan] Fix wrong parameter indices in JSFrameSpecialization.

[turbofan] Fix wrong parameter indices in JSFrameSpecialization.

We forgot to add the number of arguments parameter in
JSFrameSpecialization, which was added before the context.

R=jarin@chromium.org
BUG=chromium:552304
LOG=n

Committed: https://crrev.com/925a2006f503691252cca74c7ef15f8b82419b7b
Cr-Commit-Position: refs/heads/master@{#31856}

[Jarin, 2015-11-06 12:42:09]

lgtm

[Benedikt Meurer, 2015-11-06 12:57:54]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-11-06 12:58:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1429233004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1429233004/1

[commit-bot: I haz the power, 2015-11-06 13:12:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-06 13:13:02]

Patchset 1 (id:??) landed as
https://crrev.com/925a2006f503691252cca74c7ef15f8b82419b7b
Cr-Commit-Position: refs/heads/master@{#31856}