Extend deferred warnings system with tentative defs.

Tentative defs record the fact that some definition has been
seen at expansion time, even though that definition has not
been put into effect. They suppress warnings.

* unwind.c (tentative_defs): New static variable.
(uw_defer_warning): Throw away the warning if
it matches a tentative def.
(uw_register_tentative_def, uw_tentative_def_exists): New
functions.
(uw_dump_deferred_warnings): Purge the tag from the list of
deferred defs also.
(uw_init): gc-protect tentative_defs.
Register intrinsics register-tentative-def and
tentative-def-exists.

* unwind.h (uw_register_tentative_def,
uw_tentative_def_exists): Declared.

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