[Bug gcov-profile/83879] __gcov_dump doesn't work with dlopen-ed libraries

[nathan at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83879

--- Comment #5 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
usage is --dynamic-list=file-name, which would be a little awkward. 
--dynamic-list-data is probably more useable and available.