NewFunctionFromSharedFunctionInfo is not called with `undefined`
anymore, and so can be changed to just accept `Handle<Context>`.

Additionally, reporting script compilation to the debugger can now
be moved into `Compiler::PostInstantiation`.

R=yangguo@chromium.org

Change-Id: I0a9b3fa51f87f41b4fc97a29f79c110c6246f273
Reviewed-on: https://chromium-review.googlesource.com/1024832Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52749}