[#809] Improve interpreter re-iterating on LOOP instr

Description

Problem: Our interpreter does not treat loops and meta instructions in a proper way. Once execution of a loop comes to repeating the loop's body, it just recursively runs on LOOP body here. But if LOOP instruction had a source location or meta attached to it, they won't appear on that repetitions

Solution: Add isMetaWrapper to InterpreterState which build a wrapper attaching Meta and WithLoc along the way. This wrapper the is used when it meets loop instruction.

Related issue(s)

Resolves #809 (closed)

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