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toolchain/45412: arm--netbsdelf-as segfaults when building simple tc

>Number:         45412
>Category:       toolchain
>Synopsis:       arm--netbsdelf-as segfaults when building simple tc
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Sep 30 20:00:01 +0000 2011
>Originator:     Piotr Tworek
>Release:        NetBSD 5.1
NetBSD crow 5.1.0_PATCH NetBSD 5.1.0_PATCH (A20p) #0: Mon Aug 22 09:02:54 CEST 
2011  tworaz@crow:/usr/obj/sys/arch/i386/compile/A20p i386
After updating netbsd current source tree on 30.09.2011 hpcarm compilation 
fails in lib/csu/arm_elf/crt0.o:

dependall ===> lib/csu/arm_elf
    compile  arm_elf/crt0.o
arm--netbsdelf-gcc: Internal error: Segmentation fault (program as)
Please submit a full bug report.
See <> for instructions.

*** Failed target:  crt0.o
*** Failed command:
/home/tworaz/devel/NetBSD/src/../tools-hpcarm/bin/arm--netbsdelf-gcc -O2
-mlong-calls -fno-unit-at-a-time -O2 -fPIC -msoft-float -std=gnu99 -Wall
-Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith
-Wno-sign-compare -Wno-traditional -Wa,--fatal-warnings -Wreturn-type
-Wswitch -Wshadow -Werror
-I/home/tworaz/devel/NetBSD/src/lib/csu/arm_elf -DLIBC_SCCS -DPIC
-DDYNAMIC -DELFSIZE=32 -I/home/tworaz/devel/NetBSD/src/libexec/ld.elf_so
-I/home/tworaz/devel/NetBSD/src/lib/libc/dlfcn -DDWARF2_EH -DJCR
--sysroot=/home/tworaz/devel/NetBSD/src/../obj-hpcarm/destdir.hpcarm -c
-DCRT0 /home/tworaz/devel/NetBSD/src/lib/csu/arm_elf/crt0.c -o crt0.o.o
*** Error code 1

According to the core dump the backtrace is:
#0  0x08074ad1 in arm_cleanup ()
#1  0x0805e32f in read_a_source_file ()
#2  0x0804afeb in perform_an_assembly_pass ()
#3  0x0804bd25 in main ()

The simpliest way to reproduce the problem is:
1. Build hpcarm toolchain with: ./ -N 1 -u -U -O ../obj-hpcarm -T 
../tools-hpcarm -m hpcarm tools
2. $echo "__asm(\"nop\");" > test.c
3. arm--netbsdelf-gcc test.c -o test.o

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