c++: Cross-module partial specialiations [PR 99480]

[Nathan Sidwell]

We were	not correctly handling cross-module redeclarations of 
partial-specializations.  They have their own TEMPLATE_DECL, which we 
need to locate.  I had a FIXME there about this case.  Guess it's fixed now.

	PR 99480
         gcc/cp/
	* module.cc (depset::hash::make_dependency): Propagate flags for
         partial specialization.
         (module_may_redeclare):	Handle partial specialization.
         gcc/testsuite/
         * g++.dg/modules/pr99480_1.H: New.
         * g++.dg/modules/pr99480_b.H: New.

-- 
Nathan Sidwell
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