[cross-context] create new function prototypes in the context of the function (issue 4217).

Fix completion of try..finally (issue 2529).

Extend Annex B 3.3 sloppy-mode block-scoped hoisting to scripts, eval (issue 4441).

[V8] Add name of function for function's closure scope (Chromium issue 493156).

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/4.8.1@{#1}
Cr-Branched-From: 01590d660d6c8602b616a82816c4aea2a251be63-refs/heads/master@{#31093}