i386 assembler accepts invalid assembly code

[H. J. Lu]

Hi Dwarakanath, Michael,

i386 assembler accepts invalid assembly code:

http://sourceware.org/bugzilla/show_bug.cgi?id=3712

Your change

http://sourceware.org/ml/binutils/2006-07/msg00131.html

added the 4th operand. But it doesn't check if the 4th operand is
valid. Can you take a look?

Thanks.


H.J.