* alpha.c (alpha_ra_ever_killed): Inspect the topmost sequence,
        not whatever we're generating now.
        * alpha.c (set_frame_related_p, FRP): New.
        (alpha_expand_prologue): Mark frame related insns.
        (alpha_expand_epilogue): Likewise, but with a null FRP.
        * alpha.h (INCOMING_RETURN_ADDR_RTX): New.
        * alpha.md (exception_receiver): New.
        * alpha/crtbegin.asm (.eh_frame): New beginning.
        (__do_frame_setup, __do_frame_takedown): New.
        * alpha/crtend.asm (.eh_frame): New ending.
        * alpha/elf.h (DWARF2_DEBUGGING_INFO): Define.
        (ASM_SPEC): Don't emit both dwarf2 and mdebug.
        (ASM_FILE_START): Don't emit .file for dwarf2.

From-SVN: r22277