Description:
------------
probably somewhat related to #80046

ext/opcache/Optimizer/block_pass.c:973: assemble_code_blocks: Assertion `op_array->opcodes[b->start].opcode == 70 || op_array->opcodes[b->start].opcode == 127' failed.

print op_array->opcodes[b->start].opcode
$1 = 0 '\000'

Test script:
---------------
<?php
class p
{
    public function u()
    {
        switch ($this->z)
        {
            default:
                throw new Exception;
            case 'mysql':
                return new Xxx($this);
                break;
        }
    }
}