[Bug target/58426] vax fails to compile gcov.c in stage1

["martin at netbsd dot org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58426

--- Comment #2 from Martin Husemann <martin at netbsd dot org> ---
The more interesting XEXP(x, 0) of that rtx is the one triggering the failure:

$15 = {code = REG, mode = SImode, jump = 0, call = 0, unchanging = 0, 
  volatil = 0, in_struct = 0, used = 0, frame_related = 1, return_val = 0, 
  u = {fld = {{rt_int = 13, rt_uint = 13, 
        rt_str = 0xd <Address 0xd out of bounds>, rt_rtx = 0xd, 
        rt_rtvec = 0xd, rt_type = TQmode, rt_addr_diff_vec_flags = {
          min_align = 13, base_after_vec = 0, min_after_vec = 0, 
          max_after_vec = 0, min_after_base = 0, max_after_base = 0, 
          offset_unsigned = 0, scale = 0}, rt_cselib = 0xd, rt_tree = 0xd, 
        rt_bb = 0xd, rt_mem = 0xd, rt_reg = 0xd, rt_constant = 0xd, 
        rt_cfi = 0xd}}, hwint = {13}, block_sym = {fld = {{rt_int = 13, 
          rt_uint = 13, rt_str = 0xd <Address 0xd out of bounds>, 
          rt_rtx = 0xd, rt_rtvec = 0xd, rt_type = TQmode, 
          rt_addr_diff_vec_flags = {min_align = 13, base_after_vec = 0, 
            min_after_vec = 0, max_after_vec = 0, min_after_base = 0, 
            max_after_base = 0, offset_unsigned = 0, scale = 0}, 
          rt_cselib = 0xd, rt_tree = 0xd, rt_bb = 0xd, rt_mem = 0xd, 
          rt_reg = 0xd, rt_constant = 0xd, rt_cfi = 0xd}, {rt_int = 13, 
          rt_uint = 13, rt_str = 0xd <Address 0xd out of bounds>, 
          rt_rtx = 0xd, rt_rtvec = 0xd, rt_type = TQmode, 
          rt_addr_diff_vec_flags = {min_align = 13, base_after_vec = 0, 
            min_after_vec = 0, max_after_vec = 0, min_after_base = 0, 
            max_after_base = 0, offset_unsigned = 0, scale = 0}, 
          rt_cselib = 0xd, rt_tree = 0xd, rt_bb = 0xd, rt_mem = 0xd, 
          rt_reg = 0xd, rt_constant = 0xd, rt_cfi = 0xd}, {rt_int = 0, 
          rt_uint = 0, rt_str = 0x0, rt_rtx = 0x0, rt_rtvec = 0x0, 
          rt_type = VOIDmode, rt_addr_diff_vec_flags = {min_align = 0, 
            base_after_vec = 0, min_after_vec = 0, max_after_vec = 0, 
            min_after_base = 0, max_after_base = 0, offset_unsigned = 0, 
            scale = 0}, rt_cselib = 0x0, rt_tree = 0x0, rt_bb = 0x0, 
          rt_mem = 0x0, rt_reg = 0x0, rt_constant = 0x0, rt_cfi = 0x0}}, 
      block = 0x40060026, offset = 12}, rv = {cl = 1, decimal = 1, sign = 1, 
      signalling = 0, canonical = 0, uexp = 0, sig = {13, 0, 1074135078, 12, 
        12}}, fv = {data = {low = 13, high = 13}, mode = VOIDmode}}}