Introduce a CompilationDependency that let's us optimize the lookup of
a function's "prototype" property. This is basically the same as
InitialMapDependency, except that if the function's initial map doesn't
exist yet, it is created after compilation.

Bug: v8:7790, chromium:875175
Change-Id: I62834f1815b3cef282fa67e6d64a6ee0e3777929
Reviewed-on: https://chromium-review.googlesource.com/1184714Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55299}