vtn: Support the UniformDecoration capability.

This is needed for SPIR-V 1.6 support in OpenCL. This capability enables
the Uniform and UniformId decorations which prior were Shader only.

The CTS ends up using those decorations on function arguments, but we can
just ignore handling them there for now.

Fixes the spirv16_uniformdecoration_uniform and
spirv16_uniformdecoration_uniformid CL CTS test inside test_spirv_new.

Fixes: bb6d371c0e ("rusticl: support SPIR-V 1.5 and 1.6")
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34004>

src/compiler/spirv/spirv_to_nir.c

@@ -189,6 +189,7 @@ static const struct spirv_capabilities implemented_capabilities = {
    .UniformAndStorageBuffer8BitAccess = true,
    .UniformBufferArrayDynamicIndexing = true,
    .UniformBufferArrayNonUniformIndexingEXT = true,
+   .UniformDecoration = true,
    .UniformTexelBufferArrayDynamicIndexingEXT = true,
    .UniformTexelBufferArrayNonUniformIndexingEXT = true,
    .VariablePointers = true,

src/compiler/spirv/vtn_cfg.c

@@ -131,6 +131,8 @@ function_parameter_decoration_cb(struct vtn_builder *b, struct vtn_value *val,
    case SpvDecorationRelaxedPrecision:
    case SpvDecorationRestrict:
    case SpvDecorationRestrictPointer:
+   case SpvDecorationUniform:
+   case SpvDecorationUniformId:
    case SpvDecorationVolatile:
       break;
 

src/gallium/frontends/rusticl/mesa/compiler/clc/spirv.rs

@@ -296,6 +296,7 @@ impl SPIRVBin {
             LiteralSampler: true,
             SampledBuffer: true,
             Sampled1D: true,
+            UniformDecoration: true,
             Vector16: true,
             ..Default::default()
         }