x. Class declaration opcode formats were changed
- DECLARE_INHERITED_CLASS and DECLARE_ANON_INHERITED_CLASS now encode parent
class name in second operand directly (as IS_CONST operand). Previously,
- parent class was fetched but previous FETCH_CLASS opcode.
+ parent class was fetched by the prior FETCH_CLASS opcode.
- ADD_INTERFACE and ADD_TRAIT don't use run-time cache to keep interface or
trait. These instructions are executed once, and caching is useless.