cobol: Eliminate cobolworx UAT errors when compiling with -Os

Testcases compiled with -Os were failing because static functions and static
variables were being optimized away, because of improper data type casts, and
because strict aliasing (whatever that is) was resulting in some loss of data.
These changes eliminate those known problems.

gcc/cobol

	* cobol1.cc: (cobol_langhook_post_options): Implemented in order to set
	flag_strict_aliasing to zero.
	* genapi.cc: (set_user_status): Add comment.
	(parser_intrinsic_subst): Expand SHOW_PARSE information.
	(psa_global): Change names of return-code and upsi globals,
	(psa_FldLiteralA): Set DECL_PRESERVE_P for FldLiteralA.
	* gengen.cc: (show_type): Add POINTER type.
	(gg_define_function_with_no_parameters): Set DECL_PRESERVE_P for COBOL-
	style nested programs.  (gg_array_of_bytes): Fix bad cast.

libgcobol

	* charmaps.h: Change __gg__data_return_code to 'short' type.
	* constants.cc: Likewise.

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