c++: More set_identifier_type_value fixing [PR 99116]

My recent change looked under template_parms in two places, but that
was covering up a separate problem.  We were attempting to set the
identifier_type_value of a template_parm into the template_parm
scope.  The peeking stopped us doing that, but confused poplevel,
leaving an identifier value lying around.  This fixes the underlying
problem in do_pushtag -- we only need to set the identifier_type_value
directly when we're in a template_parm scope (a later pushdecl will
push the actual template_decl).  for non-class non-template-parm
bindings do_pushdecl already ends up manipulating
identifier_type_value correctly.

	PR c++/99116
	gcc/cp/
	* name-lookup.c (do_pushdecl): Don't peek under template_parm
	bindings here ...
	(set_identifier_type_value_with_scope): ... or here.
	(do_pushtag): Only set_identifier_type_value_with_scope at
	non-class template parm scope, and use parent scope.
	gcc/testsuite/
	* g++.dg/lookup/pr99116-1.C: New.
	* g++.dg/lookup/pr99116-2.C: New.

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