* configure.in (alpha-osf, alpha-linux): Handle ev6[78].
        * alpha.c (override_options): Recognize -mcpu=ev67.
        * alpha.h (CPP_CPU_EV67_SPEC): New.
        (CPP_CPU_DEFAULT_SPEC): Examine TARGET_CPU_DEFAULT to use it.
        (EXTRA_SPECS): Update.

From-SVN: r30923