* config/sparc/linux64.h (TARGET_DEFAULT): Make -mapp-regs
        default on linux64 again.
        * config/sparc/t-linux64: Add mno-app-regs and non-medlow code
        models for multilibing.
        * genmultilib: Accept | as alternative separator within a set in
        MULTILIB_OPTIONS.

From-SVN: r30841