Reland: [Interpreter] Transition JSFunctions to call optimized code when possible.
Now that the optimized code hangs off the feedback vector, it is possible to check whether a function has optimized code available every time it's called in the interpreter entry trampoline. If optimized code exists, the interpreter entry trampoline 'self-heals' the closure to point to the optimized code and links the closure into the optimized code list. BUG=v8:6246 Change-Id: I53b095db2a75ae4824c8195faf8649d766c86118 Reviewed-on: https://chromium-review.googlesource.com/501967Reviewed-by: Michael Stanton <mvstanton@chromium.org> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Commit-Queue: Ross McIlroy <rmcilroy@chromium.org> Cr-Commit-Position: refs/heads/master@{#45328}
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