[arm] Use position independent table switches.

[arm] Use position independent table switches.

Performance measurements show that the position independent code is
usually slightly faster than the position dependent code, and there
seems to be no noticable regression.

This also gets rid of a lot of support code that was only required to allow
embedding labels into the code stream. And it implies that neither the GC
nor the deserializer need to do anything for jump tables.

R=svenpanne@chromium.org
BUG=v8:3872
LOG=n

Committed: https://crrev.com/aa46ebe5e297af02a59ce67e13ce0fb9ebab26cb
Cr-Commit-Position: refs/heads/master@{#27646}

[Benedikt Meurer, 2015-04-08 05:34:34]

Hey Sven,

This improves the performance of switches on ARM, and also gets rid of a lot of
support code. Please take a look.

Thanks,
Benedikt

[Sven Panne, 2015-04-08 06:48:29]

lgtm

[Benedikt Meurer, 2015-04-08 06:48:39]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-04-08 06:48:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1069633002/1

[commit-bot: I haz the power, 2015-04-08 06:50:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-08 06:50:28]

Patchset 1 (id:??) landed as
https://crrev.com/aa46ebe5e297af02a59ce67e13ce0fb9ebab26cb
Cr-Commit-Position: refs/heads/master@{#27646}