Fix deferred record initialization

Put RecordFieldInit instances into creation_inits during parsing and
determine their deferrability in an InitPostScript step. Any
RecordFieldInits can be deferred are moved into deferred_inits.

Closes #3260

src/zeek-setup.cc

@@ -869,6 +869,8 @@ SetupResult setup(int argc, char** argv, Options* zopts)
 		if ( reporter->Errors() > 0 )
 			exit(1);
 
+		RecordType::InitPostScript();
+
 		telemetry_mgr->InitPostScript();
 		iosource_mgr->InitPostScript();
 		log_mgr->InitPostScript();