Patch for `LL' warnings in insn-*.c

[Richard Earnshaw]

> That particular warning comes from cpplib, which is not currently
> aware of __extension__ since it treats each token in isolation.
> 
> insn-*.c are compiled by the bootstrap compiler (in stage 1); do we
> know that this compiler will, in truth, always accept the LL suffix?
> If so, another possible change is to make -Wno-long-long override
> -Wtraditional for this warning; that would be much easier to
> implement.

Yes, I think that would be OK.  Note that LL is also not part of C90 and 
we already filter out that case for -Wno-long-long.

R.