Fixes the implementation of step 9 in the Proxy's internal [[Get]]
method:
Let targetDesc be ? target.[[GetOwnProperty]](P)
If P is an accessor, this should not result in a call to the getter.
Likewise in [[Set]] and [[Has]].
https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-get-p-receiver
Bug: chromium:776338
Change-Id: I2652ffab2b3e4c38de00a82b8419192fdc768951
Reviewed-on: https://chromium-review.googlesource.com/732897
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48825}