lowering: Don't mutate lambda in linearize
#57416
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nsajko
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compiler:lowering
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Fixes #56904.
The associated PR (#55876) compiles a finally block, then compiles a renumbered version of it. This works if
compiledoesn't mutate its input, but in reality, lambda bodies were beingset!when linearized. The "invalid syntax" error was a result of attempting to linearize a lambda twice.