ICE in `simple_memory_operand', at config/mips/mips.c:732

[Billinghurst, David (CRTS)]

Testsuite for egcs-20000612 on mips-sgi-irix6.5 with enable-checking
triggers ICE in `simple_memory_operand', at config/mips/mips.c:732 for
following cases

gcc.c-torture/compile/940712-1.c:4:
gcc.c-torture/compile/980726-1.c:10:
gcc.c-torture/compile/980726-1.c:11:
gcc.c-torture/execute/930719-1.c:17:
gcc.c-torture/unsorted/b.c:4:
gcc.c-torture/unsorted/b.c:5:
gcc.c-torture/unsorted/DFcmp.c:281:
gcc.c-torture/unsorted/DFcmp.c:43:
gcc.c-torture/unsorted/HIcmp.c:281:
gcc.c-torture/unsorted/HIcmp.c:43:
gcc.c-torture/unsorted/HIset.c:217:
gcc.c-torture/unsorted/HIset.c:43:
gcc.c-torture/unsorted/HIset.c:75:
gcc.c-torture/unsorted/load8.c:4:
gcc.c-torture/unsorted/load8.c:5:
gcc.c-torture/unsorted/QIcmp.c:281:
gcc.c-torture/unsorted/QIcmp.c:43:
gcc.c-torture/unsorted/QIset.c:217:
gcc.c-torture/unsorted/QIset.c:43:
gcc.c-torture/unsorted/QIset.c:75:
gcc.c-torture/unsorted/SFset.c:217:
gcc.c-torture/unsorted/SFset.c:43:
gcc.c-torture/unsorted/SFset.c:75:
gcc.c-torture/unsorted/SIcmp.c:281:
gcc.c-torture/unsorted/SIcmp.c:43:
gcc.c-torture/unsorted/SIset.c:217:
gcc.c-torture/unsorted/SIset.c:43:
gcc.c-torture/unsorted/SIset.c:75:
gcc.c-torture/unsorted/UHIcmp.c:281:
gcc.c-torture/unsorted/UHIcmp.c:43:
gcc.c-torture/unsorted/UQIcmp.c:281:
gcc.c-torture/unsorted/UQIcmp.c:43:
gcc.c-torture/unsorted/USIcmp.c:281:
gcc.c-torture/unsorted/USIcmp.c:43:
gcc.dg/va-arg-1.c:13:
gcc.dg/va-arg-1.c:13: