General GC optimizations (#3221)

- Enable recursive GC marking with a limited recursion count (this option is configurable)
- No need to decrease the reference count of the gray objects anymore
- Bound function object marking is seperated into a helper function

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

jerry-core/ecma/base/ecma-init-finalize.c

@@ -47,6 +47,10 @@ ecma_init (void)
   JERRY_CONTEXT (stack_base) = (uintptr_t)&sp;
 #endif /* (JERRY_STACK_LIMIT != 0) */
 
+#if (JERRY_GC_MARK_LIMIT != 0)
+  JERRY_CONTEXT (ecma_gc_mark_recursion_limit) = JERRY_GC_MARK_LIMIT;
+#endif /* (JERRY_GC_MARK_LIMIT != 0) */
+
 #if ENABLED (JERRY_ES2015_BUILTIN_PROMISE)
   ecma_job_queue_init ();
 #endif /* ENABLED (JERRY_ES2015_BUILTIN_PROMISE) */