[turbofan] Make TyperCache global and thread safe.

[turbofan] Make TyperCache global and thread safe.

This way we need the common types only once per process and we don't
need to recreate them for every compilation. It uses the same pattern
that we already apply to caching operators. This simplifies the type
cache a lot.

R=svenpanne@chromium.org

Committed: https://crrev.com/db4101ef81002b73f4a57ea6d115429061985acd
Cr-Commit-Position: refs/heads/master@{#29251}

[Benedikt Meurer, 2015-06-24 08:11:14]

bmeurer@chromium.org changed reviewers:
+ jarin@chromium.org

[Benedikt Meurer, 2015-06-24 08:11:29]

Hey Sven, Jaro,

Please take a look.

Thanks,
Benedikt

[Sven Panne, 2015-06-24 08:53:02]

lgtm

[Jarin, 2015-06-24 09:14:34]

lgtm. (although the c++11 magic frightens and confuses me)

[Benedikt Meurer, 2015-06-24 09:14:58]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-06-24 09:15:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1209513002/1

[commit-bot: I haz the power, 2015-06-24 09:16:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-24 09:16:45]

Patchset 1 (id:??) landed as
https://crrev.com/db4101ef81002b73f4a57ea6d115429061985acd
Cr-Commit-Position: refs/heads/master@{#29251}