x86_64 testsuite and few fixes for merger lossage

[Alan Modra]

On Fri, 5 Jan 2001, Jan Hubicka wrote:

> Fri Jan  5 15:31:07 MET 2001  Jan Hubicka  <jh@suse.cz>
> 	* configure.in: Define DEFAULT_ARCH for i386.
> 	* tc-i386.c (md_assemble): Return after the error message;
> 	move testing for 64bit operands to proper place.
> 
> 	* i386.exp: Add tests for presence of 32bit versus 64bit output
> 	format; run both 64bit and 32bit tests when format is available;
> 	add x86_64 test.
> 	* x86_64.s: New file.
> 	* x86_64.d: New file.

OK.

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