cobol: Plug memory leak caused by intermediate_e stack-frame variables. [PR119521]

cobol: Plug memory leak caused by intermediate_e stack-frame variables. [PR119521]

COBOL variables with attribute intermediate_e are being allocated on
the stack frame, but their data was assigned using malloc(), without
a corresponding call to free().  For numerics, the problem is solved
with a fixed allocation of sixteen bytes for the cblc_field_t::data
member (sixteen is big enough for all data types) and with a fixed
allocation of 8,192 bytes for the alphanumeric type.

In use, the intermediate numeric data types are "shrunk" to the minimum
applicable size.  The intermediate alphanumerics, generally used as
destination targets for functions, are trimmed as well.

gcc/cobol

	PR cobol/119521
	* genapi.cc: (parser_division): Change comment.
	(parser_symbol_add): Change intermediate_t handling.
	* parse.y: Multiple changes to new_alphanumeric() calls.
	* parse_ante.h: Establish named constant for date function
	calls.  Change declaration of new_alphanumeric() function.
	* symbols.cc: (new_temporary_impl): Use named constant
	for default size of temporary alphanumerics.
	* symbols.h: Establish MAXIMUM_ALPHA_LENGTH constant.

libgcobol

	PR cobol/119521
	* intrinsic.cc: (__gg__reverse): Trim final result for intermediate_e.
	* libgcobol.cc: (__gg__adjust_dest_size): Abort on attempt to increase
	the size of a result.  (__gg__module_name): Formatting.
	__gg__reverse(): Resize only intermediates