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A spec change to simplify IsRegExp has been proposed:

https://github.com/tc39/ecma262/pull/1318

This CL adds use counters for cases in which the spec change would
alter behavior:

1. o[@@match] is trueish but o is not a JSRegExp
2. o[@@match] is falseish (but not undefined) and o is a JSRegExp

This is the Chromium side of required changes.
The V8-side CL: https://crrev.com/c/1360630

Bug: v8:8522
Change-Id: I2ec9b1a5f54f8e70a02e48f280a548871990aabd
Reviewed-on: https://chromium-review.googlesource.com/c/1360730Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615507}