Introduce ShouldKeepAttributeAliveForGC() in CodeGenratorV8.pm
Introduce ShouldKeepAttributeAliveForGC() in CodeGenratorV8.pm

The current if conditions are far from understandable.
This is one of steps to clean up the conditions.
This patch just factors out the conditions into a method,
and thus does not change behavior.

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/14535003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@149582 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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