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alpha-dec-osf5.1 bootstrap failure on mainline

A bootstrap of current mainline on alpha-dec-osf5.1 stops with an ICE:

./xgcc -B./ -B/vol/gcc/share/alpha-dec-osf5.1/bin/ -isystem /vol/gcc/share/alpha-dec-osf5.1/include -isystem /vol/gcc/share/alpha-dec-osf5.1/sys-include -O2  -DIN_GCC    -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -isystem ./include  -fPIC -g  -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED  -I. -I. -I/vol/gnu/src/gcc/gcc/gcc -I/vol/gnu/src/gcc/gcc/gcc/. -I/vol/gnu/src/gcc/gcc/gcc/config -I/vol/gnu/src/gcc/gcc/gcc/../include  -DL_fixunstfdi -c /vol/gnu/src/gcc/gcc/gcc/libgcc2.c -o libgcc/./_fixunstfdi.o
/vol/gnu/src/gcc/gcc/gcc/libgcc2.c: In function `__fixunstfti':
/vol/gnu/src/gcc/gcc/gcc/libgcc2.c:865: internal compiler error: Internal compiler error in delete_insn, at cfgrtl.c:138
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
make[3]: *** [libgcc/./_fixunstfdi.o] Error 1

Here's the cc1 stack trace for reference:

#0  fancy_abort (file=0x140044869 "/vol/gnu/src/gcc/gcc/gcc/cfgrtl.c", 
    line=138, function=0x1400448ad "delete_insn")
    at /vol/gnu/src/gcc/gcc/gcc/diagnostic.c:1364
#1  0x0000000120383ee0 in delete_insn (insn=0x181080)
    at /vol/gnu/src/gcc/gcc/gcc/cfgrtl.c:138
#2  0x0000000120384340 in delete_insn_chain (start=0x181080, finish=0x181380)
    at /vol/gnu/src/gcc/gcc/gcc/cfgrtl.c:215
#3  0x000000012038443c in delete_insn_chain_and_edges (first=0x181080, 
    last=0x181380) at /vol/gnu/src/gcc/gcc/gcc/cfgrtl.c:234
#4  0x00000001203239e8 in propagate_block_delete_libcall (insn=0x181380, 
    note=0x182ea0) at /vol/gnu/src/gcc/gcc/gcc/flow.c:1589
#5  0x0000000120323cc4 in propagate_one_insn (pbi=0x1400ddf90, insn=0x181380)
    at /vol/gnu/src/gcc/gcc/gcc/flow.c:1649
#6  0x0000000120324f4c in propagate_block (bb=0x14012f1c0, live=0x11fffa9f8, 
    local_set=0x0, cond_local_set=0x0, flags=280)
    at /vol/gnu/src/gcc/gcc/gcc/flow.c:2070
#7  0x000000012032067c in update_life_info (blocks=0x0, 
    extent=UPDATE_LIFE_GLOBAL, prop_flags=383)
    at /vol/gnu/src/gcc/gcc/gcc/flow.c:665
#8  0x000000012031feb0 in life_analysis (f=0x174100, file=0x0, flags=383)
    at /vol/gnu/src/gcc/gcc/gcc/flow.c:481
#9  0x0000000120101e98 in rest_of_compilation (decl=0x16dd40)
    at /vol/gnu/src/gcc/gcc/gcc/toplev.c:3023
#10 0x0000000120073200 in c_expand_body (fndecl=0x16dd40, nested_p=0, 
    can_defer_p=1) at /vol/gnu/src/gcc/gcc/gcc/c-decl.c:6902
#11 0x0000000120072ac0 in finish_function (nested=0, can_defer_p=1)
    at /vol/gnu/src/gcc/gcc/gcc/c-decl.c:6769
#12 0x000000012003caa4 in yyparse () at c-parse.y:396
#13 0x000000012004bd3c in c_common_parse_file (set_yydebug=0)
    at /vol/gnu/src/gcc/gcc/gcc/c-lex.c:165
#14 0x00000001200fed44 in compile_file ()
    at /vol/gnu/src/gcc/gcc/gcc/toplev.c:2094
#15 0x0000000120107e44 in do_compile ()
    at /vol/gnu/src/gcc/gcc/gcc/toplev.c:5185
#16 0x0000000120107f30 in toplev_main (argc=17, argv=0x11fffc018)
    at /vol/gnu/src/gcc/gcc/gcc/toplev.c:5217
#17 0x00000001200fceb8 in main (argc=17, argv=0x11fffc018)
    at /vol/gnu/src/gcc/gcc/gcc/main.c:35

	Rainer
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