[turbofan] Pass scope infos as static operator parameters.

[turbofan] Pass scope infos as static operator parameters.

This changes the operators for JSCreate[Block|Script]Context to take
their ScopeInfo as a static parameter as opposed to a value input and
in turn allows for easier access to that parameter during lowerings.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1379593002

Cr-Commit-Position: refs/heads/master@{#31009}