Fix CI: add missing capability deps and patch difftest rspirv

- Add ShaderViewportMaskNV, ShaderViewportIndexLayerEXT, and
  SPV_NV_viewport_array2 to all-builtins.rs compile flags to satisfy
  ShaderStereoViewNV capability dependency chain.

- Add rspirv/spirv patch to difftest workspace Cargo.toml to match
  root workspace, fixing compilation errors from newer SPIR-V opcodes
  (ConditionalEntryPointINTEL, TypeUntypedPointerKHR, etc.) that only
  exist in the sdk-update branch.

Author: LegNeato

tests/compiletests/ui/spirv-attr/all-builtins.rs

@@ -1,6 +1,6 @@
 // build-pass
 // only-vulkan1.1
-// compile-flags: -Ctarget-feature=+DeviceGroup,+DrawParameters,+FragmentBarycentricNV,+FragmentBarycentricKHR,+FragmentDensityEXT,+FragmentFullyCoveredEXT,+Geometry,+GroupNonUniform,+GroupNonUniformBallot,+MeshShadingNV,+MultiView,+MultiViewport,+RayTracingKHR,+SampleRateShading,+ShaderSMBuiltinsNV,+ShaderStereoViewNV,+StencilExportEXT,+Tessellation,+ext:SPV_AMD_shader_explicit_vertex_parameter,+ext:SPV_EXT_fragment_fully_covered,+ext:SPV_EXT_fragment_invocation_density,+ext:SPV_EXT_shader_stencil_export,+ext:SPV_KHR_ray_tracing,+ext:SPV_NV_fragment_shader_barycentric,+ext:SPV_NV_mesh_shader,+ext:SPV_NV_shader_sm_builtins,+ext:SPV_NV_stereo_view_rendering
+// compile-flags: -Ctarget-feature=+DeviceGroup,+DrawParameters,+FragmentBarycentricNV,+FragmentBarycentricKHR,+FragmentDensityEXT,+FragmentFullyCoveredEXT,+Geometry,+GroupNonUniform,+GroupNonUniformBallot,+MeshShadingNV,+MultiView,+MultiViewport,+RayTracingKHR,+SampleRateShading,+ShaderSMBuiltinsNV,+ShaderStereoViewNV,+ShaderViewportIndexLayerEXT,+ShaderViewportMaskNV,+StencilExportEXT,+Tessellation,+ext:SPV_AMD_shader_explicit_vertex_parameter,+ext:SPV_EXT_fragment_fully_covered,+ext:SPV_EXT_fragment_invocation_density,+ext:SPV_EXT_shader_stencil_export,+ext:SPV_KHR_ray_tracing,+ext:SPV_NV_fragment_shader_barycentric,+ext:SPV_NV_mesh_shader,+ext:SPV_NV_shader_sm_builtins,+ext:SPV_NV_stereo_view_rendering,+ext:SPV_NV_viewport_array2
 
 use spirv_std::glam::*;
 use spirv_std::matrix::Matrix4x3;

tests/difftests/tests/Cargo.lock

@@ -68,6 +68,12 @@ num-traits = { version = "0.2.15", default-features = false }
 glam = { version = ">=0.30.8", default-features = false }
 bytemuck = { version = "1.14", features = ["derive"] }
 
+# Patch rspirv/spirv to use newer versions with additional SPIR-V opcodes needed by spirv-tools.
+# Must match the root workspace patch in /Cargo.toml.
+[patch.crates-io]
+rspirv = { git = "https://github.com/gfx-rs/rspirv", branch = "sdk-update" }
+spirv = { git = "https://github.com/gfx-rs/rspirv", branch = "sdk-update", package = "spirv" }
+
 # Enable incremental by default in release mode.
 [profile.release]
 incremental = true