[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 #34 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Feel free to commit the exact fix as in ...

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