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radv: significantly less performance than amdgpu-pro in the AMD FSR2 sample

The AMD FSR2 sample app performs significantly worse with RADV than with amdgpu-pro. Default settings just starting the app is about 92 fps with RADV (latest main or 22.1.7), 102 fps with amdvlk, and 186 fps with amdgpu-pro 22.20 on a 6700XT.
RADV_DEBUG=llvm or RADV_DEBUG=nonggc make it even slower.

To reproduce download the latest windows build of the sample app from the github release section, extract, and run with:

cd FidelityFX-FSR2-v2.1.0/bin
wine FSR2_Sample_VK.exe

my vulkaninfo: vkinfo.txt

Edited by M Briar
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