c++: nested catch in ctor fn-try-block [PR61611]

c++: nested catch in ctor fn-try-block [PR61611]

Being in_function_try_handler isn't enough to satisfy the condition of
reaching the end of such a handler; in this case, we're reaching the end of
a handler within that handler, so we don't want the special semantics.

	PR c++/61611

gcc/cp/ChangeLog:

	* except.c (in_nested_catch): New.
	(expand_end_catch_block): Check it.

gcc/testsuite/ChangeLog:

	* g++.dg/eh/ctor-fntry1.C: New test.