Fixes the mutually-recursive toplevel definitions case. This could be
fixed by rewriting bodies as letrecs, as r6 does, but that's not really
repl-compatible.
* module/system/il/ghil.scm (ghil-lookup): Ok, if we can't locate a
variable, mark it as unresolved.
* module/system/il/compile.scm (make-glil-var): Compile unresolved
variables as <glil-late-bound> objects.
* module/system/il/glil.scm: Add <glil-late-bound> definition.
* module/system/vm/assemble.scm (codegen): And, finally, when we see a
<vlate-bound> object, allocate a slot for it in the object vector,
setting it to a symbol. Add a new pair of instructions to resolve that
symbol to a variable at the last minute.
* src/vm_loader.c (load-number): Bugfix: the radix argument should be
SCM_UNDEFINED in order to default to 10.
(late-bind): Add an unresolved symbol to the object vector. Could be
replaced with load-symbol I guess.
* src/vm_system.c (late-variable-ref, late-variable-set): New
instructions to do late symbol binding.
* testsuite/Makefile.am (vm_test_files):
* testsuite/t-mutual-toplevel-defines.scm: New test, failing for some
reason involving the core even? and odd? definitions.
