aarch64: Fix ICE in JSON tuning schema with dispatch scheduling and update schema...

aarch64: Fix ICE in JSON tuning schema with dispatch scheduling and update schema for SVE costs.

This patch fixes the following bugs:

1) For SVE vector costs [sve_vec_cost], the JSON schema did not list the
inherited members from the base structure, only the SVE specific ones. Updated
the schema to include all the members and regenerated the printing/parsing
routines.

2) After dispatch scheduling, if someone uses -fdump-tuning-model with
mcpu=olympus, it will have the flag for dispatch scheduling enabled. Then, if
someone uses that dump against any -mcpu other than Olympus for tuning, it will
ICE as we enable dispatch scheduling but don't provide the data. Updated this
to clear the flag if dispatch_constraints is NULL.

Signed-off-by: Soumya AR <soumyaa@nvidia.com>
gcc/ChangeLog:

	* config/aarch64/aarch64-json-schema.h: Include inherited members for
	SVE vector costs.
	* config/aarch64/aarch64-json-tunings-parser-generated.inc
	(parse_vec_costs_sve): Regenerate.
	* config/aarch64/aarch64-json-tunings-parser.cc
	(aarch64_load_tuning_params_from_json_string): Clear dispatch scheduling
	flag if dispatch_constraints is NULL.
	* config/aarch64/aarch64-json-tunings-printer-generated.inc
	(serialize_vec_costs_sve): Regenerate.