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Clean up all use of the *-space-free-pointers.
* These are symbols whose value slots contain unboxed word-aligned
byte pointers. Thus, they appear to lisp as fixnums. They are not,
however, guaranteed to be word pointers.
* Shift by n-fixnum-tag-bits instead of shifting by word-shift or
scaling by n-word-bytes in order to obtain byte pointers.