Add clip distances validation for maxInterStageShaderVariables#8762

ErichDonGubler wants to merge 5 commits intogfx-rs:trunkgfx-rs/wgpu:trunkfrom

erichdongubler-mozilla:max_inter_stage_shader_variables-clip_distanceserichdongubler-mozilla/wgpu:max_inter_stage_shader_variables-clip_distancesCopy head branch name to clipboard