Fix JIT call chain check without call opcode

The do_fcall opcode may have been optimized away if an opcode like
exit is present in the arguments. In that case the opcode scan
would g

Fix JIT call chain check without call opcode

The do_fcall opcode may have been optimized away if an opcode like
exit is present in the arguments. In that case the opcode scan
would go past the end of the op array.

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