Revert of Remove ExternalArray, derived types, and element kinds

Revert of Remove ExternalArray, derived types, and element kinds (patchset #5 id:80001 of https://codereview.chromium.org/1254623002/)

Reason for revert:
[Sheriff] Breaks several layout tests, e.g.:
http://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2032/builds/1067

Several output lines change from PASS to FAIL. If the changes are intended, please land a needsmanualrebaseline change in blink first.

Original issue's description:
> Remove ExternalArray, derived types, and element kinds
>
> BUG=v8:3996
> R=jarin@chromium.org, mvstanton@chromium.org, bmeurer@chromium.org
> LOG=y
>
> Committed: https://crrev.com/607ef7c6009a24ebf195b4cab7b0b436c5afd21c
> Cr-Commit-Position: refs/heads/master@{#29872}

TBR=bmeurer@chromium.org,hpayer@chromium.org,jarin@chromium.org,mvstanton@chromium.org,jochen@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:3996
Committed: https://crrev.com/814048a04f667f4537ad80a3ae63d3699b4afdb2
Cr-Commit-Position: refs/heads/master@{#29883}

[Michael Achenbach, 2015-07-27 20:31:29]

Created Revert of Remove ExternalArray, derived types, and element kinds

[commit-bot: I haz the power, 2015-07-27 20:31:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1257223002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1257223002/1

[commit-bot: I haz the power, 2015-07-27 20:32:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-27 20:32:24]

Patchset 1 (id:??) landed as
https://crrev.com/814048a04f667f4537ad80a3ae63d3699b4afdb2
Cr-Commit-Position: refs/heads/master@{#29883}