Return this in Context::native_context if receiver is a native context.

Return this in Context::native_context if receiver is a native context.

Checking for native context is faster than checking for global object. Additionally it speeds up the case were it actually is the native context, while not slowing down the alternative case. The bootstrapper only needs to access the native context from the native context, so this avoids the expensive fallback.

BUG=

Committed: https://crrev.com/fdc5c1343cb5786fa0a21feefa34a472a64369f1
Cr-Commit-Position: refs/heads/master@{#29423}

[Toon Verwaest, 2015-07-01 13:30:10]

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

[Toon Verwaest, 2015-07-01 13:30:10]

ptal

[Jakob Kummerow, 2015-07-01 14:14:27]

LGTM with nit.

https://codereview.chromium.org/1214903017/diff/1/src/contexts.cc
File src/contexts.cc (right):

https://codereview.chromium.org/1214903017/diff/1/src/contexts.cc#newcode89
src/contexts.cc:89: // Fast case: the global object for this context has been
set.  In
nit: outdated comment.

[Toon Verwaest, 2015-07-01 14:21:42]

Updated comment

[Toon Verwaest, 2015-07-01 14:22:26]

The CQ bit was checked by verwaest@chromium.org

[Toon Verwaest, 2015-07-01 14:22:27]

The patchset sent to the CQ was uploaded after l-g-t-m from
jkummerow@chromium.org
Link to the patchset: https://codereview.chromium.org/1214903017/#ps20001
(title: "Update comment")

[commit-bot: I haz the power, 2015-07-01 14:22:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1214903017/20001

[commit-bot: I haz the power, 2015-07-01 15:34:24]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-01 15:34:43]

Patchset 2 (id:??) landed as
https://crrev.com/fdc5c1343cb5786fa0a21feefa34a472a64369f1
Cr-Commit-Position: refs/heads/master@{#29423}