spirv: add support for SpvCapabilityFragmentBarycentricKHR

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23254>

src/compiler/shader_info.h

@@ -63,6 +63,7 @@ struct spirv_supported_capabilities {
    bool float64_atomic_add;
    bool float64_atomic_min_max;
    bool float64;
+   bool fragment_barycentric;
    bool fragment_density;
    bool fragment_fully_covered;
    bool fragment_shader_pixel_interlock;

src/compiler/spirv/spirv_to_nir.c

@@ -5066,6 +5066,10 @@ vtn_handle_preamble_instruction(struct vtn_builder *b, SpvOp opcode,
          spv_check_supported(ray_tracing_position_fetch, cap);
          break;
 
+      case SpvCapabilityFragmentBarycentricKHR:
+         spv_check_supported(fragment_barycentric, cap);
+         break;
+
       default:
          vtn_fail("Unhandled capability: %s (%u)",
                   spirv_capability_to_string(cap), cap);