Use data instead of code to shrink ".zo" sizes by 10-30%.
When Racket code contains a literal that cannot be serialized directly
by Chez Scheme (such as a keyword or an immutable string that should
be datum-interned), the old approach was to generate Scheme code to
construct the literal through a lifted `let` binding. To handle paths
associated with procedures, however, Chez Scheme's `fasl-write` had
been extended to allow arbitrary values to be intercepted during fasl
and passed back in to `fasl-read`. Using that strategy for all Racket
literals simplifies the implementation and reduces compiled code. It
also makes closures smaller, while increases the number of
relocations. DrRacket's foorprint shrinks by about 1%, but the main
affect is on disk space for a Racket installation.
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