Pass flags to #[Attribute] on internal attributes

While the specified restriction was checked, the #[Attribute]
attribute did not specify the flags parameter, so that Reflection
retu

Pass flags to #[Attribute] on internal attributes

While the specified restriction was checked, the #[Attribute]
attribute did not specify the flags parameter, so that Reflection
returned incorrect information.

In particular, Attribute itself has a CLASS target, not an ALL
target.

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Add many missing closing PHP tags to tests

Closes GH-5958

Replace EXPECTF when possible

Closes GH-5779

Implement Attribute Amendments.

RFC: https://wiki.php.net/rfc/attribute_amendments

Support for attribute grouping is left out, because the short
attribute syntax RFC will likely

Implement Attribute Amendments.

RFC: https://wiki.php.net/rfc/attribute_amendments

Support for attribute grouping is left out, because the short
attribute syntax RFC will likely make it obsolete.

Closes GH-5751.

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Add Attributes

Co-authored-by: Martin Schröder <m.schroeder2007@gmail.com>