Instead, it is supposed to just return an empty context if it failed.
Also don't invoke interceptors (we don't for the parts that deserialize
from the snapshot anyways).

BUG=v8:5830
R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2636903002
Cr-Commit-Position: refs/heads/master@{#42404}