This is ready for review, but may not go upstream until after the release.
-- v3: vkd3d-shader/spirv: Add a parameter name for int64 capability. tests/shader-runner: Add 64-bit bitwise tests. tests/shader-runner: Add 64-bit arithmetic tests. tests/shader-runner: Introduce a 'shader int64' requirement directive. vkd3d-shader/spirv: Emit an error if 64-bit integers are used. vkd3d-shader/dxil: Introduce an instruction flag to suppress masking of bitwise shift counts.