The two bool parameters are used for DCHECks in most places. By
introducing more specialized enumes kAccessorGetterProperty and
kAccessorSetterProperty we can simplify the checks.

Bug: v8:7926
Change-Id: I61023f2da0d96ca5a4fba65c6ead309567144786
Reviewed-on: https://chromium-review.googlesource.com/1202822
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55648}