Remove support for alternative array syntax in PHP 8 parser

We cannot support both this syntax and property hooks. Drop
support for the alternative syntax in the PHP 8 parser. The
PH

Remove support for alternative array syntax in PHP 8 parser

We cannot support both this syntax and property hooks. Drop
support for the alternative syntax in the PHP 8 parser. The
PHP 7 parser still supports it.

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Represent names using string rather than array of parts

In most circumstances we are interested in the whole string, not
the parts split by namespace separator. As names are common, this

Represent names using string rather than array of parts

In most circumstances we are interested in the whole string, not
the parts split by namespace separator. As names are common, this
representation measurably improves memory usage and performance.

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Add newline at end of file for many tests

Add the newline in reconstructTest() and run updateTests.php, to
reduce spurious diffs in the future.

Rename Scalar\LNumber to Scalar\Int_

Remove PHP 5 parser

Always use Identifier nodes

The parser will now always generate Identifier nodes (for
non-namespaced identifiers). This obsoletes the useIdentifierNodes
parser option.

Node

Always use Identifier nodes

The parser will now always generate Identifier nodes (for
non-namespaced identifiers). This obsoletes the useIdentifierNodes
parser option.

Node constructors still accepts strings and will implicitly create
an Identifier wrapper. Identifier implement __toString(), so that
outside of strict-mode many things continue to work without changes.

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Perform automated test update

Import some UVS tests