* flow.c (EH_USES): Provide default.
        (calculate_global_regs_live): Use it for EH edges and noreturn calls.
        * doc/tm.texi (EH_USES): New.

        * config/ia64/ia64.c (ia64_eh_uses): New.
        * config/ia64/ia64-protos.h: Update.
        * config/ia64/ia64.h (EH_USES): New.

From-SVN: r51060