Andreas Kling c372a084a2 LibJS/Bytecode: Add and use copy_if_needed_to_preserve_evaluation_order ...

This is a new Bytecode::Generator helper that takes an operand and
returns the same operand, or a copy of it, in case a copy is required
to preserve correct evaluation order.

This can be used in a bunch of places where we're worried about
clobbering some value after obtaining it.

Practically, locals are always copied, and temporary registers as well
as constants are returned as-is.

2024-06-02 16:34:08 +02:00

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