Encode RelocInfo extra tag to fit changed RelocInfo kind enum.

Encode RelocInfo extra tag to fit changed RelocInfo kind enum.

This fixes some failures on MIPS. Though not all of them, since
MIPS does not correctly implement set_target_internal_reference.

R=svenpanne@chromium.org

Committed: https://crrev.com/cc2c902fa5d032c87d28e82a7422dfd31361ca73
Cr-Commit-Position: refs/heads/master@{#27183}

[Sven Panne, 2015-03-13 13:00:33]

The CQ bit was checked by svenpanne@chromium.org

[Sven Panne, 2015-03-13 13:00:34]

lgtm

[commit-bot: I haz the power, 2015-03-13 13:00:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1008823002/1

[commit-bot: I haz the power, 2015-03-13 13:39:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-13 13:39:35]

Patchset 1 (id:??) landed as
https://crrev.com/cc2c902fa5d032c87d28e82a7422dfd31361ca73
Cr-Commit-Position: refs/heads/master@{#27183}

[MTBrandyberry, 2015-03-13 13:56:44]

On 2015/03/13 12:57:01, Yang wrote:

Thanks for implementing the recommended changes.  One question:

Shouldn't LAST_STANDARD_NONCOMPACT_ENUM now be INTERNAL_REFERENCE_ENCODED?