added lox test files

lox.t/benchmark/invocation.lox

@@ -0,0 +1,73 @@
+// This benchmark stresses just method invocation.
+
+class Foo {
+  method0() {}
+  method1() {}
+  method2() {}
+  method3() {}
+  method4() {}
+  method5() {}
+  method6() {}
+  method7() {}
+  method8() {}
+  method9() {}
+  method10() {}
+  method11() {}
+  method12() {}
+  method13() {}
+  method14() {}
+  method15() {}
+  method16() {}
+  method17() {}
+  method18() {}
+  method19() {}
+  method20() {}
+  method21() {}
+  method22() {}
+  method23() {}
+  method24() {}
+  method25() {}
+  method26() {}
+  method27() {}
+  method28() {}
+  method29() {}
+}
+
+var foo = Foo();
+var start = clock();
+var i = 0;
+while (i < 500000) {
+  foo.method0();
+  foo.method1();
+  foo.method2();
+  foo.method3();
+  foo.method4();
+  foo.method5();
+  foo.method6();
+  foo.method7();
+  foo.method8();
+  foo.method9();
+  foo.method10();
+  foo.method11();
+  foo.method12();
+  foo.method13();
+  foo.method14();
+  foo.method15();
+  foo.method16();
+  foo.method17();
+  foo.method18();
+  foo.method19();
+  foo.method20();
+  foo.method21();
+  foo.method22();
+  foo.method23();
+  foo.method24();
+  foo.method25();
+  foo.method26();
+  foo.method27();
+  foo.method28();
+  foo.method29();
+  i = i + 1;
+}
+
+print clock() - start;