This change changes bootstrapping semantics for intercepted global objects. Unlike before, we'll now also call into the interceptor during bootstrapping. This affects properties loaded from within the runtime, such as global.Array and global.Symbol. The embedder will need to make sure that those values are the expected values during bootstrapping.

BUG=chromium:505998
LOG=n

Review URL: https://codereview.chromium.org/1220813005

Cr-Commit-Position: refs/heads/master@{#29414}