anv: Skip HiZ and CCS ambiguates which preceed fast-clears

This gets rid of multiple HiZ ambiguate operations per frame in
Witcher 3.
Status Job ID Name Coverage
  Container+Docs
manual #3494171
aarch64 manual
arm_build
manual #3494172
manual
arm_test-base
manual #3494168
manual
x86_build-base
manual #3494170
manual
x86_build_old
manual #3494169
manual
x86_test-base
 
  Container 2
created #3494181
arm64_test
created #3494176
i386_build
created #3494173
aarch64
kernel+rootfs_arm64
created #3494174
aarch64
kernel+rootfs_armhf
created #3494177
ppc64el_build
created #3494178
s390x_build
created #3494175
x86_build
created #3494179
x86_test-gl
created #3494180
x86_test-vk
 
  Meson X86 64
created #3494185
meson-clang
created #3494184
meson-classic
created #3494186
meson-clover
created #3494187
meson-clover-old-llvm
created #3494183
meson-gallium
created #3494182
meson-testing
created #3494188
meson-vulkan
 
  Scons
created #3494189
allowed to fail
scons-win64
 
  Meson Misc
created #3494191
aarch64
meson-arm64
created #3494192
aarch64
meson-arm64-build-test
created #3494190
aarch64
meson-armhf
created #3494193
meson-i386
created #3494196
meson-mingw32-x86_64
created #3494195
kvm
meson-ppc64el
created #3494194
kvm
meson-s390x