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fix for 18751 breaks Darwin

Hi Alan,

your patch

2004-12-23 Alan Modra <amodra@bigpond.net.au>

        PR target/18751
        * config/rs6000/rs6000.c (legitimate_lo_sum_address_p): Return
        false for anything larger than 32 bits in 32-bit code.

appears to cause this when bootstrapping on Darwin:

./xgcc -B./ -B/usr/local/powerpc-apple-darwin7.6.0/bin/ -isystem /usr/local/powerpc-apple-darwin7.6.0/include -isystem /usr/local/powerpc-apple-darwin7.6.0/sys-include -L/Volumes/Data/build/egcs-mainline/gcc/../ld -O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition -isystem ./include -Wa,-force_cpusubtype_ALL -g -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -I. -I. -I/Network/Servers/hills/Volumes/capanna/gkeating/co/egcs-mainline/gcc/ gcc -I/Network/Servers/hills/Volumes/capanna/gkeating/co/egcs-mainline/gcc/ gcc/. -I/Network/Servers/hills/Volumes/capanna/gkeating/co/egcs-mainline/gcc/ gcc/../include -I./../intl -I/Network/Servers/hills/Volumes/capanna/gkeating/co/egcs-mainline/gcc/ gcc/../libcpp/include -DL_floatdidf -fvisibility=hidden -DHIDE_EXPORTS -c /Network/Servers/hills/Volumes/capanna/gkeating/co/egcs-mainline/gcc/ gcc/libgcc2.c -o libgcc/./_floatdidf.o
/Network/Servers/hills/Volumes/capanna/gkeating/co/egcs-mainline/gcc/ gcc/libgcc2.c: In function '__floatdidf':
/Network/Servers/hills/Volumes/capanna/gkeating/co/egcs-mainline/gcc/ gcc/libgcc2.c:1355: error: insn does not satisfy its constraints:
(insn 53 55 44 0 /Network/Servers/hills/Volumes/capanna/gkeating/co/egcs-mainline/gcc/ gcc/libgcc2.c:1348 (set (reg:DF 32 f0 [124])
(mem/u/i:DF (lo_sum:SI (reg:SI 9 r9)
(const:SI (minus:SI (symbol_ref/u:SI ("*LC0") [flags 0x2])
(symbol_ref:SI ("<pic base>") [flags 0x180])))) [5 S8 A64])) 302 {*movdf_hardfloat32} (nil)
(expr_list:REG_EQUIV (const_double:DF 4.503601774854144e+15 [0x0.800004p+53])
(nil)))
/Network/Servers/hills/Volumes/capanna/gkeating/co/egcs-mainline/gcc/ gcc/libgcc2.c:1355: internal compiler error: in reload_cse_simplify_operands, at postreload.c:391

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