upgrade 6-STABLE to -CURRENT on sparc64 renders box unusable

[Michiel Boland]

To follow up on myself, it appears that ld-elf.so.1 crashes somewhere in 
__getosreldate. I have no idea how to debug this further.

000000000000e140 <__getosreldate>:
     e140:       9d e3 bf 20     save  %sp, -224, %sp
     e144:       2f 00 04 96     sethi  %hi(0x125800), %l7
     e148:       7f ff ff f6     call  e120 <__sys_mmap+0x40>
     e14c:       ae 05 e0 b8     add  %l7, 0xb8, %l7
     e150:       03 00 00 01     sethi  %hi(0x400), %g1
     e154:       82 10 61 f8     or  %g1, 0x1f8, %g1
     e158:       f0 5d c0 01     ldx  [ %l7 + %g1 ], %i0
     e15c:       c2 06 00 00     ld  [ %i0 ], %g1

     ^ crash appears to be here somewhere