Provide extension hint for aarch64 target (PR driver/83193).

2018-10-31  Martin Liska  <mliska@suse.cz>

	PR driver/83193
	* common/config/aarch64/aarch64-common.c (aarch64_parse_extension):
	Add new argument invalid_extension.
	(aarch64_get_all_extension_candidates): New function.
	(aarch64_rewrite_selected_cpu): Add NULL to function call.
	* config/aarch64/aarch64-protos.h (aarch64_parse_extension): Add
	new argument.
	(aarch64_get_all_extension_candidates): New function.
	* config/aarch64/aarch64.c (aarch64_parse_arch): Add new
	argument invalid_extension.
	(aarch64_parse_cpu): Likewise.
	(aarch64_print_hint_for_extensions): New function.
	(aarch64_validate_mcpu): Provide hint about invalid extension.
	(aarch64_validate_march): Likewise.
	(aarch64_handle_attr_arch): Pass new argument.
	(aarch64_handle_attr_cpu): Provide hint about invalid extension.
	(aarch64_handle_attr_isa_flags): Likewise.
2018-10-31  Martin Liska  <mliska@suse.cz>

	PR driver/83193
	* gcc.target/aarch64/spellcheck_7.c: New test.
	* gcc.target/aarch64/spellcheck_8.c: New test.
	* gcc.target/aarch64/spellcheck_9.c: New test.

From-SVN: r265686