[Bug sanitizer/63927] AddressSanitizer painfully slow on ppc64

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63927

--- Comment #9 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Bill Schmidt from comment #8)
> Patch submitted as http://reviews.llvm.org/D11552.

Wow. Very nice speedup for such a simple patch.
Would be great if could be cherry-picked directly.