rs6000.c (rs6000_stack_info): Allocate space for eh_return data registers.

rs6000.c (rs6000_stack_info): Allocate space for eh_return data registers.

        * config/rs6000/rs6000.c (rs6000_stack_info): Allocate space
        for eh_return data registers.
        (rs6000_emit_prologue): Save eh_return data registers.
        (rs6000_emit_epilogue): Force inline restores if eh_return.
        Restore eh_return data registers.  Mind EH_RETURN_STACKADJ_RTX.
        * config/rs6000/rs6000.h (rs6000_stack_t): Add ehrd_offset.
        (EH_RETURN_DATA_REGNO, EH_RETURN_STACKADJ_RTX): New.
        (EPILOGUE_USES): True for TOC_REGISTER if calls_eh_return and
        the target uses one.
        * config/rs6000/rs6000.md (eh_epilogue, eh_reg_restore): Remove.
        (return_eh_si, return_eh_di): Remove.
        (eh_return): New, from corpse of eh_epilogue.
        (eh_set_lr_si, eh_set_lr_di): New.

From-SVN: r40927