Cleaning up expand optabs code

[Georg-Johann Lay]

Andreas Krebbel schrieb:
> On 03/22/2011 06:48 PM, Richard Henderson wrote:
> 
>> Ok.  Watch out for other target problems this week.

libgcc fails to build for avr (SVN 171446)

../../../../../gcc.gnu.org/trunk/libgcc/../gcc/libgcc2.c: In function
'__negdi2':
../../../../../gcc.gnu.org/trunk/libgcc/../gcc/libgcc2.c:68:17:
internal compiler error: in maybe_gen_insn, at  optabs.c:7123

Target: avr
Configured with: ../../gcc.gnu.org/trunk/configure --target=avr
--prefix=/local/gnu/install/gcc-4.6 --enable-languages=c,c++
--disable-libssp --disable-libada --disable-nls --disable-shared

Attached the source where it crashes; compile with -S -Os

Building last 4.7 snapshot + avr backend from HEAD works fine.

Johann
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