* config/tc-mmix.c (loc_asserts): New variable.

	* config/tc-mmix.c (loc_asserts): New variable.
	(mmix_greg_internal): Handle expressions not determinable at first
	pass.
	(s_loc): Ditto.  Record expressions where the section isn't
	determinable at the first pass, and assume they don't refer to
	other sections.
	(mmix_md_end): Verify that recorded LOC expressions weren't
	to other sections, else emit error messages.