[interpreter] Fix label binding for unreached labels.

[interpreter] Fix label binding for unreached labels.

This fixes the label binding mechanism that forwards a label to another
already bound target label. For source labels that are not being reached
by a jump, we should not try to patch jump sites. We still bind the
source label to reflect the target position though, just in case this
binding method will be used for backwards branches in the future.

R=rmcilroy@chromium.org
TEST=webkit/fast/js/parser-syntax-check

Committed: https://crrev.com/27a9009a7c4933d632f74ce0114df9aa82e81010
Cr-Commit-Position: refs/heads/master@{#34759}

[rmcilroy, 2016-03-14 18:20:37]

LGTM, thanks!

[Michael Starzinger, 2016-03-14 18:26:49]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2016-03-14 18:26:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1804643002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1804643002/1

[commit-bot: I haz the power, 2016-03-14 18:28:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-14 18:29:17]

Description was changed from

==========
[interpreter] Fix label binding for unreached labels.

This fixes the label binding mechanism that forwards a label to another
already bound target label. For source labels that are not being reached
by a jump, we should not try to patch jump sites. We still bind the
source label to reflect the target position though, just in case this
binding method will be used for backwards branches in the future.

R=rmcilroy@chromium.org
TEST=webkit/fast/js/parser-syntax-check
==========

to

==========
[interpreter] Fix label binding for unreached labels.

This fixes the label binding mechanism that forwards a label to another
already bound target label. For source labels that are not being reached
by a jump, we should not try to patch jump sites. We still bind the
source label to reflect the target position though, just in case this
binding method will be used for backwards branches in the future.

R=rmcilroy@chromium.org
TEST=webkit/fast/js/parser-syntax-check

Committed: https://crrev.com/27a9009a7c4933d632f74ce0114df9aa82e81010
Cr-Commit-Position: refs/heads/master@{#34759}
==========

[commit-bot: I haz the power, 2016-03-14 18:29:18]

Patchset 1 (id:??) landed as
https://crrev.com/27a9009a7c4933d632f74ce0114df9aa82e81010
Cr-Commit-Position: refs/heads/master@{#34759}