Move d3d11 BCX textures to the "UNREACHABLE" section for clears BCX textures can't be rendered to or cleared. Bug: angleproject:7855 Change-Id: Id2564e92db692aeae9a0da47d55a8ef18b66c4d0 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4184938 Commit-Queue: Chris Dalton <chris@rive.app> Reviewed-by: Rafael Cintron <rafael.cintron@microsoft.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>