* exception.cc (struct cp_eh_info): Add handlers field.
	(__cp_push_exception): Initialize it.
	(__cp_pop_exception): Decrement it.  Don't pop unless it's 0.
	(__throw_bad_exception): Remove.
	* except.c (call_eh_info): Add handlers field.
	(get_eh_handlers): New fn.
	(push_eh_cleanup): Increment handlers.

Fixes P15031.C, rethrow[45].C

From-SVN: r16694