LibJS: Move async_block_start out of ECMAScriptFunctionObject

Author: https://github.com/davidot
Commit: 39b134e8c1
Pull-request: https://github.com/SerenityOS/serenity/pull/11957
Reviewed-by: https://github.com/emanuele6
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.h

@@ -13,6 +13,8 @@
 
 namespace JS {
 
+void async_block_start(VM&, NonnullRefPtr<Statement> const& parse_node, PromiseCapability const&, ExecutionContext&);
+
 // 10.2 ECMAScript Function Objects, https://tc39.es/ecma262/#sec-ecmascript-function-objects
 class ECMAScriptFunctionObject final : public FunctionObject {
     JS_OBJECT(ECMAScriptFunctionObject, FunctionObject);
@@ -97,7 +99,6 @@ private:
     void ordinary_call_bind_this(ExecutionContext&, Value this_argument);
 
     void async_function_start(PromiseCapability const&);
-    void async_block_start(PromiseCapability const&, ExecutionContext&);
 
     ThrowCompletionOr<void> function_declaration_instantiation(Interpreter*);