New Sparc bootstrap failure

[Richard Kenner]

/vienna.a/gnatmail-5/build-vienna/src/gcc/xgcc -B/vienna.a/gnatmail-5/build-vienna/src/gcc/ -B/opt/gnu/gnat/sparc-sun-solaris2.8/bin/ -B/opt/gnu/gnat/sparc-sun-solaris2.8/lib/ -isystem /opt/gnu/gnat/sparc-sun-solaris2.8/include -O2  -DIN_GCC    -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -isystem ./include  -fPIC -g1 -DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED  -I. -I. -I. -I./. -I./config -I./../include -fexceptions -c ./unwind-dw2.c -o libgcc/./unwind-dw2.o
unwind-dw2.c: In function `extract_cie_info':
unwind-dw2.c:290: Internal compiler error in do_SUBST, at combine.c:439
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