* config/tc-msp430.c (msp430_operands): Accept "<foo>.a" as an alias

	* config/tc-msp430.c (msp430_operands): Accept "<foo>.a" as an alias
	for "<foo>a".  Issue error messages for unrecognised or corrrupt
	size extensions.

	* gas/msp430/bad.s: New test: Checks erroneous size extensions.
	* gas/msp430/bad.d: New test command file.
	* gas/msp430/bad.l: New file: Expected error messages.
	* gas/msp430/msp430.exp: Run the new test.
	* gas/msp430/msp430x.s: Add "<foo>.a" aliases of "<foo>a"
	instructions.
	* gas/msp430/msp430x.d: Update expected disassembly.