Backports Mesa main's unconditional flip of .fragmentStoresAndAtomics
to true in src/panfrost/vulkan/panvk_vX_physical_device.c. Closes
the Dawn-WebGPU adapter rejection at PhysicalDeviceVk.cpp:250 that
caused brave-vulkan to fall back to the SwiftShader CPU adapter on
PineTab2/Mali-G52, per marfrit/panvk-bifrost#2.
Phase 7 verify on ohm (PineTab2, RK3566, Mali-G52 r1 MC1) with a
locally-built r5 lib installed to /tmp/r5_test_lib/:
dEQP-VK.glsl.atomic_operations.*:
r4: 48 pass / 0 fail / 992 NotSupported (1040 total)
r5: 80 pass / 0 fail / 960 NotSupported (1040 total)
delta: +32 newly-passing, zero new failures
dEQP-VK.image.store.*:
r4: 2772 pass / 0 fail / 238 NotSupported (3010 total)
r5: 2772 pass / 0 fail / 238 NotSupported (3010 total)
delta: identical (image.store is independent of the flag)
The disjunction with instance->force_enable_shader_atomics is kept as
a documented kill-switch even though the compiler folds it away —
it leaves the DRI option pan_force_enable_shader_atomics semantically
wired for future rebases or downstream debugging.
Patch reviewed via 2nd-model pass (per bugfix-process step 4):
recommended keeping the disjunction (applied), Bifrost-only-vs-unconditional
left unconditional to match upstream (applied), pre-ship CTS subset
(applied with results above).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
