glasm: Implement InstanceId and VertexId

src/shader_recompiler/backend/glasm/emit_glasm_context_get_set.cpp

@@ -65,6 +65,12 @@ void EmitGetAttribute(EmitContext& ctx, IR::Inst& inst, IR::Attribute attr,
     case IR::Attribute::PositionW:
         ctx.Add("MOV.F {}.x,{}.position.{};", inst, ctx.stage_name, swizzle);
         break;
+    case IR::Attribute::InstanceId:
+        ctx.Add("MOV.S {}.x,{}.instance;", inst, ctx.stage_name);
+        break;
+    case IR::Attribute::VertexId:
+        ctx.Add("MOV.S {}.x,{}.id;", inst, ctx.stage_name);
+        break;
     default:
         throw NotImplementedException("Get attribute {}", attr);
     }