Adds the Object.fromEntries() method behind
--harmony-object-from-entries.


Includes an initial implementation of the new experimental builtin
Object.fromEntries implemented by Daniel Clifford, and
has been modified by Caitlin Potter to support a fast case to skip
the iterator protocol when it can be done unobservably in common cases.

There are some incidental changes: A number of CSA macros have been
updated to use TNodes, and some Context arguments have been
re-arranged to be implicit in Torque.


There are also a number of mjsunit tests written mirroring and
expanding on the test262 tests.

BUG=v8:8021

Change-Id: I1c12bee8a2f98c6297b77d5d723910a5e3b630cc
Co-authored-by: Daniel Clifford <danno@chromium.org>
Co-authored-by: Caitlin Potter <caitp@igalia.com>
Reviewed-on: https://chromium-review.googlesource.com/c/1337585
Commit-Queue: Daniel Clifford <danno@chromium.org>
Reviewed-by: Daniel Clifford <danno@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57667}