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backtrace: don't cons large lists when RCX is overwritten inside XEPs.
To present a list with the actual number of passed arguments in the
backtrace, clean-xep used the arg-count register and added missing
arguments in the form of #<unknown>, but if the register is
overwritten by other code, it could cons very large lists, exhausting
heap. Do such arg-list clean up only upon INVALID-ARG-COUNT-ERROR.