PR libstdc++/12736
* bits/demangle.h (qualifier_list<Allocator>::decode_KVrA): Added.
(qualifier_list<Allocator>::decode_qualifiers): Collect concatenated
K, V, r and A qualifiers before processing them as a group.
* testsuite/demangle/abi_text/01.cc: Reordered CV-qualifiers.
* testsuite/demangle/regression/cw-16.cc: New.

From-SVN: r73339