porting gcc can't compile libgcc2.c

[Eric Fisher]

Hello,

Here is a question about porting gcc.  After I modified machine.md and
other backend files, I can make cc1 and xgcc now. But libgcc2.o still
failed. I'd like to know does we must make libgcc2.o since the target
machine don't have float registers and 64bit registers.

Thanks a lot.

Eric