Add the stubs for JavaScript's '<<', '>>' and '>>>' operators and lets Ignition make use of them in the respective bytecode handlers.

Committed: https://crrev.com/599369d6b8e1a5ccdca857def06eebcbacf47dd4
Cr-Commit-Position: refs/heads/master@{#35433}

Review URL: https://codereview.chromium.org/1881003002

Cr-Commit-Position: refs/heads/master@{#35446}