Patch from Nicolas Pitre

One case was found when the kernel is compiled with -O2 (instead of the 
default -Os).  However, all gcc-3.* versions seem to have a problem with 
this.  Instead of blacklisting them all unconditionally, better just abort
when a bad case occurs especially since this bad case doesn't seem to
appear with current default compiler flags.  Depends on patch #1824.