[Bug target/59844] Powerpc64le cannot bootstrap with -O3/-mcpu=power8

[meissner at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59844

--- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> ---
Created attachment 31858
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31858&action=edit
Proposed patch to fix the problem

Patch tested by Bill Schmitd, and passes the regression testing.