port 54bab695 (r30747).

original commit message:

    Move the implementation of the Abstract Equality Comparison to the
    runtime and thereby remove the EQUALS dispatcher builtin. Also remove
    the various runtime entry points that were only used to support the
    EQUALS builtin.

    Now the Abstract Equality Comparison is also using the correct
    ToPrimitive implementation, which properly supports @@toPrimitive.

BUG=

Review URL: https://codereview.chromium.org/1349623002

Cr-Commit-Position: refs/heads/master@{#30780}