[Bug sanitizer/59009] libsanitizer merge from upstream r191666 breaks bootstrap on powerpc64-linux

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59009

--- Comment #36 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Give me 1-2 hours. 
> Just in case, please verify that the patch still works on Mac 10.6 
> (I don't have access to 10.6)

Already done: see comment 27. Anyway, I guarantee a quick feedback!-)