Fix RX gas testsuite failures by accounting for new variations in the disassembler's output.

	* rx-decode.opc (bwl): Allow for bogus instructions with a size
	field of 3.
	(sbwl, ubwl, SCALE): Likewise.
	* rx-decode.c: Regenerate.

	* gas/rx/mov.d: Update expected disassembly.
Fix typo in changelog entry.