The prologue checks if optimized code exists, and if not, continues
execution of the current function. Otherwise, it jumps to the address
specified in the native module's code_table.

Also-by: clemensh@chromium.org
Change-Id: If3e76de02115f44ab7758590a949c3f0965a11ca
Reviewed-on: https://chromium-review.googlesource.com/985837
Commit-Queue: Kim-Anh Tran <kimanh@google.com>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52471}