Revert of Externalize deoptimization reasons.

Revert of Externalize deoptimization reasons. (patchset #7 id:120001 of https://codereview.chromium.org/874323003/)

Reason for revert:
This CL breaks RelocInfo::INTERNAL_REFERENCE (and maybe others that come after DEOPT_REASON), which is currently (mostly) unused on tip-of-tree, but will be used for jump tables soon(ish) and should therefore work. It seems to be a problem with implicitly assumptions about the number of reloc info modes. Needs further investigation.

Original issue's description:
> Externalize deoptimization reasons.
>
> 1) The hardcoded strings were converted into DeoptReason enum.
>
> 2) Deopt comment were converted into a pair location and deopt reason entries so
> the deopt reason tracking mode would less affect the size of the RelocInfo table and heap.
>
> 3) DeoptReason entry in RelocInfo reuses kCommentTag value and generates short entry in RelocInfo table.
>
> BUG=452067
> LOG=n
>
> Committed: https://crrev.com/c49820e45b57f128a98690940875c049f612dde6
> Cr-Commit-Position: refs/heads/master@{#26434}
>
> Committed: https://crrev.com/ec42e002da03adb2db968dd5b7453341ddc59a5c
> Cr-Commit-Position: refs/heads/master@{#26448}

TBR=alph@chromium.org,mstarzinger@chromium.org,svenpanne@chromium.org,yurys@chromium.org,loislo@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=452067
Committed: https://crrev.com/368a503cc1493b0de56393e3bb91e4b57d74de58
Cr-Commit-Position: refs/heads/master@{#26457}

[Benedikt Meurer, 2015-02-05 12:02:00]

Created Revert of Externalize deoptimization reasons.

[commit-bot: I haz the power, 2015-02-05 12:02:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/900223002/1

[commit-bot: I haz the power, 2015-02-05 12:03:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-05 12:03:33]

Patchset 1 (id:??) landed as
https://crrev.com/368a503cc1493b0de56393e3bb91e4b57d74de58
Cr-Commit-Position: refs/heads/master@{#26457}

[Benedikt Meurer, 2015-02-05 12:07:55]

To move on with this, I'd suggest to put DEOPT_REASON after INTERNAL_REFERENCE;
that should help with finding the places were the implicit assumptions are
broken by introducing DEOPT_REASON.