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'WRITEABLEP' and macro-expansion-cache

Actually, it is PUREP which MACROMEMO calls.  Even if pure code is
writable, you don't want to put pointers to impure code in it because it
won't be GC protected.  I hope you haven't changed it.

Note that this is the right thing for MACROMEMO to do, independently of
changing DISPLACE.  MACROMEMO wants to do something else rather than just
become a NOP in that case.