Reland "Vulkan: Avoid content restore by detecting no-op stencil"
This relands commit 243d0f89.

Reland "Vulkan: Restore at the end of RP if write-after-invalidate"
This relands commit e5d52ac3.

Reland "Vulkan: Invalidate/restore depth/stencil separately."
This relands commit 61fa0878.

Reland "Vulkan: Move content-defined tracking to ImageHelper"
This relands commit 2392e6b3.

Reason for revert: Caused crashes in Fuchsia x64 and on ARM.
Reland fixes content defined for external images.

Original CL message:

Content-defined tracking was done in render targets prior to this
change.  This had multiple drawbacks:

- When a framebuffer attachment is changed (including the first time
  it's set), it's unknown whether the contents of the attachment is
  defined.
- Invalidate takes effect at the end of render pass, at which point the
  render target objects may be gone.  Attachment ImageHelpers are
  however correctly tracked.

This change moves content-defined tracking to the ImageHelper itself,
and tracks it per subresource.  ImageHelper::onWrite() now receives the
subresource that is being written, and marks it as having defined
content.

A future optimization can make use of this change to
ImageHelper::onWrite to track "dirty" subresources.  This can lead to
the removal of unnecessary barriers when same-kind writes are done on
different subresources of the image.  See http://anglebug.com/3347#c15

Bug: b/167275320
Bug: angleproject:4836
Bug: angleproject:5159
Change-Id: If5c1ae7152657fd7c94db7d55bea4fb9ddf835ba
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2464825Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>