[Bug sanitizer/61955] libsanitizer fails to compile on RHEL4

[dvyukov at google dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61955

--- Comment #8 from Dmitry Vyukov <dvyukov at google dot com> ---
Kostya, Alexey, Eugeniy, please land this fix to llvm tree while I am OOO.