[Bug sanitizer/78663] [7 Regression] Hundreds of asan failures on x86_64-apple-darwin10 at r243019

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78663

--- Comment #8 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Created attachment 40646
>   --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40646&action=edit
> Fix 2

I have tested the patch on darwin10 and 16. On darwin10 the failures are fixed
as with the Iain's patch, no regression on darwin16. Thanks.