zink: add debug assert to verify that zink_clear_framebuffer() is accurate

this should never be called for buffers that don't have pending clears
40 jobs for !10705 with zink-clear_tweaks in 8 seconds (queued for 4 seconds)
detached
Status Job ID Name Coverage
  Sanity
passed #9591008
sanity

00:00:08

 
  Container
manual #9591011
aarch64 manual
arm_build
manual #9591012
windows shell 1809 mesa manual
windows_build_vs2019
manual #9591009
manual
x86_build-base
manual #9591010
manual
x86_test-base
 
  Container 2
created #9591017
android_build
created #9591014
i386_build
created #9591020
kernel+rootfs_amd64
created #9591021
aarch64
kernel+rootfs_arm64
created #9591022
aarch64
kernel+rootfs_armhf
created #9591015
ppc64el_build
created #9591016
s390x_build
created #9591013
x86_build
created #9591018
x86_test-gl
created #9591019
x86_test-vk
 
  Meson X86 64
created #9591028
meson-clang
created #9591029
meson-clover
created #9591025
meson-clover-testing
created #9591026
meson-gallium
created #9591027
meson-release
created #9591023
meson-testing
created #9591024
meson-testing-asan
created #9591030
meson-vulkan
 
  Build Misc
created #9591031
arm_test
created #9591032
meson-android
created #9591034
aarch64
meson-arm64
created #9591035
aarch64
meson-arm64-asan
created #9591036
aarch64
meson-arm64-build-test
created #9591033
aarch64
meson-armhf
created #9591037
meson-i386
created #9591040
meson-mingw32-x86_64
created #9591039
meson-ppc64el
created #9591038
kvm
meson-s390x
 
  Intel
created #9591043
mesa-ci-aarch64-lava-collabora manual
iris-amly-traces:amd64
created #9591041
mesa-ci-aarch64-lava-collabora manual
iris-apl-traces:amd64
created #9591042
mesa-ci-aarch64-lava-collabora manual
iris-glk-traces:amd64
 
  Layered Backends
created #9591047
zink-lvp-gl
created #9591045
zink-lvp-gles2
created #9591046
zink-lvp-gles3
created #9591044
zink-piglit-quick_gl