public static boolean isReturn(int op) {
		return switch (op) {
			case IRETURN, LRETURN, FRETURN, DRETURN, ARETURN, RETURN -> true;
			default -> false;
		};
	}
@param op
		Instruction opcode.

@return {@code true} when it is a return operation.
recaf-core/src/main/java/software/coley/recaf/util/AsmInsnUtil.java