[turbofan] Rename --context-specialization to --function-context-specialization.

[turbofan] Rename --context-specialization to --function-context-specialization.

This name makes it clear that the flag (also the variant in the Compiler)
is talking about specializing to the function context instead of i.e. the
native context.

R=mstarzinger@chromium.org

Committed: https://crrev.com/175edfb4701a63f3e4470363bd8b5d47f91488dc
Cr-Commit-Position: refs/heads/master@{#30934}

[Benedikt Meurer, 2015-09-25 10:43:35]

Hey Michi,

As discussed offline.
Please take a look.

Thanks,
Benedikt

[Michael Starzinger, 2015-09-25 10:46:49]

LGTM.

[Benedikt Meurer, 2015-09-25 10:47:02]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-09-25 10:47:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1372513003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1372513003/1

[commit-bot: I haz the power, 2015-09-25 11:33:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-25 11:33:46]

Patchset 1 (id:??) landed as
https://crrev.com/175edfb4701a63f3e4470363bd8b5d47f91488dc
Cr-Commit-Position: refs/heads/master@{#30934}