Introduce optional_expr

Remove parenthesis_expr

This was necessary previously to handle yields, now it only clutters
up the grammar.

Simplify `argument` production

Move =&new deprecation message into compiler

Handle remaining magic constants in parser as well

As far as I can see the !filename case cannot occur, so I dropped
it.

Add backup_doc_comment production

Bison can't detect the type of a mid-rule action, even if it accesses
$<str>$, so need to create a separate rule for this.

eval() with parse error uses clean shutdown now

Add type annotations to parser

Conflicts:

Zend/zend_language_parser.y

master renames phase 1

Fix encoding declaration handling

As the encoding declaration influences lexing it needs to be
immidiately handled in the parser.

Implement a[0] syntax from merge

first shot on merging the core fro the int64 branch

Support doc comments for propreties

Disable restrictions regarding arrays in constants at run-time.
For the discussion around it, see the thread on the mailing list:
http://www.mail-archive.com/internals@lists.php.net/msg68245.

Disable restrictions regarding arrays in constants at run-time.
For the discussion around it, see the thread on the mailing list:
http://www.mail-archive.com/internals@lists.php.net/msg68245.html

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Add zend_ prefix for emit_op(_tmp)

zend_ast_create determined child count automatically

Remove zend_ast_create_unary etc

Cleanup dead/duplicate code

Add zend_ast_list* variant to parser stack element

Minor cleanups in AST code

Use separate node type for lists

This saves storing the children count for normal ast nodes.

Store lineno for zval ast nodes more efficiently

Use more specific parser stack nodes

Separate class type and start lineno

Store doc comments in separate stack entry from start lineno