[Bug sanitizer/59061] Port leaksanitizer

[Joost.VandeVondele at mat dot ethz.ch]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59061

--- Comment #41 from Joost VandeVondele <Joost.VandeVondele at mat dot ethz.ch> ---
(In reply to Kostya Serebryany from comment #40)
> Is there anything else left in this bug? 
> If not, please close this one and open another for the next problem(s)

I'll close it as soon as libbacktrace is used with sanitizer in trunk (see
comment #12), but if Jakob feels this is covered by e.g. PR59136, this one can
be closed, indeed.