* libsupc++/exception_support.h: New header file.

	* libsupc++/vec.cc: Include it.
	(__cxa_vec_new2): Recatch exceptions before rethrows.
	(__cxa_vec_new3): Likewise.
	(__cxa_vec_ctor): Likewise.
	(__cxa_vec_cctor): Likewise.
	(__cxa_vec_dtor): Likewise.
	(__cxa_vec_delete2): Likewise.
	(__cxa_vec_delete3): Likewise.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@37551 138bc75d-0d04-0410-961f-82ee72b054a4