Set the constant pool size to 0 on architectures that do not use it.

Set the constant pool size to 0 on architectures that do not use it.

Turns out we've been putting garbage into code->constant_pool_offset
for quite some time.

R=jkummerow@chromium.org
BUG=

Committed: https://crrev.com/9917f3375ff4b38df1746fccea6d48d33e12ea35
Cr-Commit-Position: refs/heads/master@{#32269}

[Jakob Kummerow, 2015-11-25 12:36:03]

lgtm

[titzer, 2015-11-25 12:56:19]

The CQ bit was checked by titzer@chromium.org

[commit-bot: I haz the power, 2015-11-25 12:56:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1478713002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1478713002/1

[commit-bot: I haz the power, 2015-11-25 13:10:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-25 13:10:36]

Patchset 1 (id:??) landed as
https://crrev.com/9917f3375ff4b38df1746fccea6d48d33e12ea35
Cr-Commit-Position: refs/heads/master@{#32269}