Keeping the {owned_code_} vector sorted might add unnecessary work
executed during compilation and under a mutex.
This CL moves the sort operation into {Lookup()}, such that it can be
executed in bulks and at later stages.

R=mstarzinger@chromium.org

Bug: v8:8916
Change-Id: I8d5f4520e4ce087234c0a1e3d97e7e98229206eb
Reviewed-on: https://chromium-review.googlesource.com/c/1476994
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59900}