[turbofan] make live ranges stateless

[turbofan] make live ranges stateless

this is necessary for the greedy allocator to use the relevant functions, as well as the sanity of someone looking at the code

BUG=

Committed: https://crrev.com/157c64f560cb1956c8317b1c8556f6d6203b245a
Cr-Commit-Position: refs/heads/master@{#28006}

[Sven Panne, 2015-04-22 12:19:56]

svenpanne@chromium.org changed reviewers:
+ svenpanne@chromium.org

[Sven Panne, 2015-04-22 12:19:57]

lgtm

[dcarney, 2015-04-22 12:20:07]

The CQ bit was checked by dcarney@chromium.org

[commit-bot: I haz the power, 2015-04-22 12:20:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1056063004/1

[commit-bot: I haz the power, 2015-04-22 12:45:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-22 13:19:39]

Patchset 1 (id:??) landed as
https://crrev.com/157c64f560cb1956c8317b1c8556f6d6203b245a
Cr-Commit-Position: refs/heads/master@{#28006}