glsl: translate mesa stage for mesh shader

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Acked-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36405>

src/compiler/glsl/glsl_parser_extras.cpp

@@ -662,6 +662,10 @@ mesa_stage_to_gl_stage_bit(unsigned stage)
       return GL_FRAGMENT_SHADER_BIT;
    case MESA_SHADER_COMPUTE:
       return GL_COMPUTE_SHADER_BIT;
+   case MESA_SHADER_TASK:
+      return GL_TASK_SHADER_BIT_EXT;
+   case MESA_SHADER_MESH:
+      return GL_MESH_SHADER_BIT_EXT;
    default:
       UNREACHABLE("glsl parser: invalid shader stage");
    }