Move different handling of serialized syntax data to the schemify
layer instead of te expander, so that the result of compiling in
machine-independent form is the same for traditional Racket and Racket
CS.
Although `raco dec` cannot yet usefully decompile Racket CS compiled
code, the underlying `zo-parse` and `zo-marshal` functions can now at
least read and re-write that format by just keeping the bytes for the
CS-specific part, and it can also now rouind-trip the machine- and
VM-independent format.
Lots of plumbling was in place to preserve the source name (instead of
the symbol generated to avoid collisions for macro-introduced
definitions), but some small pieces were missing.
Closes#2288
This commit merges changes that were developed in the "racket7" repo.
See that repo (which is no longer modified) for a more fine-grained
change history.
The commit includes experimental support for running Racket on Chez
Scheme, but that "CS" variant is not built by default.
