add interceptors which do not mask existing properties

add interceptors which do not mask existing properties

R=verwaest@chromium.org

BUG=

Committed: https://crrev.com/0880d4da26d5db48c9c1784e6c4d53aaf473ef59
Cr-Commit-Position: refs/heads/master@{#27271}

[dcarney, 2015-03-11 10:47:35]

dcarney@chromium.org changed reviewers:
+ verwaest@chromium.org

[dcarney, 2015-03-11 10:48:27]

ptal - the handler-compiler change is hacky atm as i didn't want to deal with
cross platform changes until you're okay with the lookup changes

[Toon Verwaest, 2015-03-11 14:09:35]

The lookup iterator side of things looks fine.

https://codereview.chromium.org/962613002/diff/200001/src/lookup-inl.h
File src/lookup-inl.h (right):

https://codereview.chromium.org/962613002/diff/200001/src/lookup-inl.h#newcode96
src/lookup-inl.h:96: !isolate_->IsInternallyUsedPropertyName(name_)) {
You don't need these, given that you had to have access to the entire chain to
get here.

[dcarney, 2015-03-18 11:15:35]

okay, ptal

[Toon Verwaest, 2015-03-18 12:42:21]

lgtm

[dcarney, 2015-03-18 12:45:36]

The CQ bit was checked by dcarney@chromium.org

[commit-bot: I haz the power, 2015-03-18 12:45:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/962613002/260001

[commit-bot: I haz the power, 2015-03-18 12:50:47]

Committed patchset #14 (id:260001)

[commit-bot: I haz the power, 2015-03-18 12:50:59]

Patchset 14 (id:??) landed as
https://crrev.com/0880d4da26d5db48c9c1784e6c4d53aaf473ef59
Cr-Commit-Position: refs/heads/master@{#27271}