[patch] Fix ASAN failures on SPARC64/Linux

[Eric Botcazou]

> It actually is something that works with all the VA sizes that are
> supported.

Well, there were changes in the past that seem to indicate that this has not 
always been true but, of course, the very specific VM layout on SPARC 64-bit 
(apparently inherited from Solaris) makes things much more convoluted...

Moreover, I'm not sure this is a very important issue, people presumably don't 
run binaries compiled with -fsanitize=address in production, so having to 
recompile with a matching GCC version doesn't seem that much of a hurdle.

-- 
Eric Botcazou