[crankshaft] Remove adventurous operator< for Handle<Map>.

[crankshaft] Remove adventurous operator< for Handle<Map>.

This operator< overload is rather dangerous for handles. And we don't
actually need a std::set in the chunk builder, since duplicates are
automatically eliminated later when the code dependencies are committed.

R=jarin@chromium.org

Committed: https://crrev.com/d82c163de4a076632479a1916d4f147f5260d435
Cr-Commit-Position: refs/heads/master@{#29401}

[Benedikt Meurer, 2015-07-01 07:17:45]

Hey Jaro,

No words necessary. Please take a look.

Thanks,
Benedikt

[Jarin, 2015-07-01 07:23:19]

Awesome! lgtm.

[Benedikt Meurer, 2015-07-01 07:24:12]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-07-01 07:24:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1214573004/1

[commit-bot: I haz the power, 2015-07-01 08:12:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-01 08:12:50]

Patchset 1 (id:??) landed as
https://crrev.com/d82c163de4a076632479a1916d4f147f5260d435
Cr-Commit-Position: refs/heads/master@{#29401}