Instead of collecting eagerly compilable inner function literals (IIFEs
etc.) during AST numbering, collect them during bytecode generation,
exposing them on the CompilationJob.

Bug: v8:7178
Change-Id: I47451f412d2796e5857b4bc38c4f29c80cb0745d
Reviewed-on: https://chromium-review.googlesource.com/873872
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50842}