[Bug sanitizer/89308] [8 only] The sanitizers do no longer work on GCC 8 with newer kernels

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89308

--- Comment #4 from seurer at gcc dot gnu.org ---
The above patch pulls in just enough of the changes from trunk to disable ASLR
for powerpc64 while leaving things alone for everyone else.