[PATCH] Restore read/source-info in support.scm and export it officially from (chicken syntax)

[Peter Bex]

Hi all,

I was checking the Salmonella results and it seems a good number of eggs
are actually relying on chicken.compiler.support#read/source-info and
therefore break with the current master:
http://salmonella-linux-x86.call-cc.org/master/clang/linux/x86/2023/06/28/yesterday-diff/

The attached patch restores the procedure in support.scm, but keeps the
implementation itself in chicken.syntax, where it makes more sense.
Since these eggs are using it, that TODO above ##sys#read/source-info
is settled - it's useful enough for those eggs, so let's just expose
it publically and document it.

I noticed there's also an error in the "trace" egg.  This probably has
something to do with the changes in the call chain.  Not sure how, but
I'll investigate.

Cheers,
Peter

0001-Restore-read-source-info-in-support.scm-and-export-f.patch
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