cobol: Optimized alpha-to-alpha moves. [PR119455]

cobol: Optimized alpha-to-alpha moves. [PR119455]

Code for implementing many common scenarios of "MOVE <literal> TO
<alphanumeric>" and " MOVE <alphanumeric> to <alphanumeric> " is created
directly through GENERIC rather than by calling the general-purpose
libgcobol __gg__move routine.

gcc/cobol/ChangeLog:

	PR cobol/119455
	* genapi.cc (mh_source_is_group): Formatting.
	(mh_source_is_literalA): Implement accelerated move.
	(mh_alpha_to_alpha): New function; implements accelerated move.
	(move_helper): Calls new mh_alpha_to_alpha.