libstdc++: Do not use facets cached in ios for ALT128 build [PR103387]

libstdc++: Do not use facets cached in ios for ALT128 build [PR103387]

For the powerpc64le build with two different long double
representations, we cannot use the ios_base::_M_num_put and
ios_base::_M_num_get pointers, because they might have been initialized
in a translation unit using the other long double type. With the changes
to add __try_use_facet to GCC 13 the cache isn't really needed now, we
can just access the right facet in the locale directly, without needing
RTTI checks.

libstdc++-v3/ChangeLog:

	PR libstdc++/103387
	* include/bits/istream.tcc (istream::_M_extract(ValueT&)): Use
	std::use_facet instead of cached _M_num_get facet.
	(istream::operator>>(short&)): Likewise.
	(istream::operator>>(int&)): Likewise.
	* include/bits/ostream.tcc (ostream::_M_insert(ValueT)): Use
	std::use_facet instead of cached _M_num_put facet.

(cherry picked from commit ec12639c82e944d37200a744156e183ea19add00)