Connor Abbott authored Nov 25, 2021 and Marge Bot committed Jan 10, 2022

This allows the wavesize to be controlled per-shader. This will be used
by VK_EXT_subgroup_size_control, and freedreno will also need it if
legacy ARB_shader_ballot is to be supported (since it forces a wavesize
of 64 or less).

Part-of: <!13960>