Assembler documenation update

[Nick Clifton]

Hi Guys,

  I have checked in the patch below to add documentation for the
  --listing-XXX series of command line switches supported by GAS.  The
  patch also includes a paragraph explaining why listings created when
  -pipe is used do not include assembler comments in them.

Cheers
        Nick

2001-03-23  Nick Clifton  <nickc@redhat.com>

	* doc/as.texinfo: Document --listing-XXX command line switches.
	Explain why listings behave differently when -pipe is used.