When looking for private members in an object for the inspector,
we check if that object is a class constructor with the a bit
has_static_private_methods set on its SFI. If it
is, we look for any variables in the context locals
with a VariableMode associated with private methods or accessors
and a IsStaticFlag being kStatic.

This patch also filters out static private methods when inspecting
instances.

Design doc: https://docs.google.com/document/d/1N91LObhQexnB0eE7EvGe57HsvNMFX16CaWu-XCTnnmY/edit
See also: https://docs.google.com/document/d/14maU596YbHcWR7XR-_iXM_ANhAAmiuRlJZysM61lqaE/edit

Bug: v8:9839, v8:8330
Change-Id: Idad15349c983898de2ce632c38b0174da10e639d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1955664Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Joyee Cheung <joyee@igalia.com>
Cr-Commit-Position: refs/heads/master@{#66636}

This patch implements inspector support for private instance methods:

- Previously to implement brand checking for instances with private
  instance methods we store the brand both as the value with the brand
  itself as the key in the stances. Now we make the value the context
  associated with the class instead.
- To retrieve the private instance methods and accessors from the
  instances at runtime, we look into the contexts stored with the
  brands, and analyze the scope info to get the names as well as
  context slot indices of them.
- This patch extends the `PrivatePropertyDescriptor` in the inspector
  protocol to include optional `get` and `set` fields, and make the
  `value` field optional (similar to `PropertyDescriptor`s).
  Private fields or private instance methods are returned in the
  `value` field while private accessors are returned in the `get`
  and/or `set` field. Property previews for the instaces containing
  private instance methods and accessors are also updated similarly,
  although no additional protocol change is necessary since the
  `PropertyPreview` type can already be used to display accessors.

Design doc: https://docs.google.com/document/d/1N91LObhQexnB0eE7EvGe57HsvNMFX16CaWu-XCTnnmY/edit

Bug: v8:9839, v8:8330
Change-Id: If37090bd23833a18f75deb1249ca5c4405ca2bf2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1934407
Commit-Queue: Joyee Cheung <joyee@igalia.com>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65337}