Enhance target and target_clone error messages.

Enhance target and target_clone error messages.

2019-05-02  Martin Liska  <mliska@suse.cz>

	* cgraphclones.c: Call valid_attribute_p with 1 for
	target_clone.
	* config/i386/i386-c.c (ix86_pragma_target_parse): Use 0 as
	it's for target attribute.
	* config/i386/i386-protos.h (ix86_valid_target_attribute_tree):
	Add new boolean argument.
	* config/i386/i386.c (ix86_valid_target_attribute_inner_p):
	Likewise.
	(ix86_valid_target_attribute_tree): Pass target_clone_attr
	to ix86_valid_target_attribute_inner_p.
	(ix86_valid_target_attribute_p): Pass flags argument to
	ix86_valid_target_attribute_inner_p.
	(get_builtin_code_for_version): Use 0 as it's target attribute.
2019-05-02  Martin Liska  <mliska@suse.cz>

	* gcc.target/i386/funcspec-4.c: Update scanned pattern.
	* g++.target/i386/pr57362.C: Likewise.

From-SVN: r270789