String.prototype.match is specified to call out to the current
value of RegExp.prototype[Symbol.match] when passed a string argument,
rather than the original value. This patch updates the RegExp code
to do that.

R=yangguo@chromium.org
BUG=v8:4602
LOG=Y

Review URL: https://codereview.chromium.org/1821773003

Cr-Commit-Position: refs/heads/master@{#35001}