We need to skip past namespace decls when scanning the bind
expression var lists checking for local vars.

gcc/cp/ChangeLog:

	PR c++/95711
	* coroutines.cc (register_local_var_uses): Skip past
	namespace decls.

gcc/testsuite/ChangeLog:

	PR c++/95711
	* g++.dg/coroutines/pr95711.C: New test.

(cherry picked from commit 06ed4aae1c2fa84b7050a286d866db4a6def3c36)