* mmo.c (mmo_write_section_description): New function broken out

	* mmo.c (mmo_write_section_description): New function broken out
	of mmo_internal_write_section.
	(mmo_internal_write_section): For each of .text and .data, call
	mmo_write_section_description before outputting contents if it has
	nontrivially deducible vma or contents.
	(mmo_has_leading_or_trailing_zero_tetra_p): New function.
	(mmo_canonicalize_symtab): Adjust absolute symbols to .data
	symbols if found within the .data address range.