This will allow getting the entire scope chain from a SharedFunctionInfo
which in turn will allow for generating bytecode when we just have the
SFI

R=verwaest@chromium.org,marja@chromium.org
BUG=v8:5215

Review-Url: https://codereview.chromium.org/2271993002
Cr-Commit-Position: refs/heads/master@{#39243}