Support catching exceptions without capturing them to variables

RFC: https://wiki.php.net/rfc/non-capturing_catches

Closes GH-5345.

Add support for the mixed type

RFC: https://wiki.php.net/rfc/mixed_type_v2
Closes GH-5313

Co-authored-by: Dan Ackroyd <danack@basereality.com>

Handle static return type in AST printer

Fixes OSS-Fuzz #20782.

Move undefined constant error into get_constant_ex

All the other error conditions are already handled in there, so
this one should be as well.

Merge branch 'PHP-7.4'

* PHP-7.4:
Fix AST printing of nullable builtin types

Merge branch 'PHP-7.3' into PHP-7.4

* PHP-7.3:
Fix AST printing of nullable builtin types

Fix AST printing of nullable builtin types

Fixes oss-fuzz #19109.

Implement union types

According to RFC: https://wiki.php.net/rfc/union_types_v2

The type representation now makes use of both the pointer payload
and the type mask at the same t

Implement union types

According to RFC: https://wiki.php.net/rfc/union_types_v2

The type representation now makes use of both the pointer payload
and the type mask at the same time. Additionall, zend_type_list is
introduced as a new kind of pointer payload, which is used to store
multiple class types. Each of the class types is a tagged pointer,
which may be either a class name or class entry. The latter is only
used for typed properties, while arguments/returns will instead use
cache slots. A type list can contain a mix of both names and CEs at
the same time, as not all classes may be resolvable.

One thing this is missing is support for union types in arginfo
and stubs, which I want to handle separately.

I've also dropped the special object code from the JIT implementation
for now -- I plan to add this back in a different form at a later time.
For now I did not want to include non-trivial JIT changes together
with large functional changes.

Another possible piece of follow-up work is to implement "iterable"
as an internal alias for "array|Traversable". I believe this will
eliminate quite a few special-cases that had to be implemented.

Closes GH-4838.

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Fix consistency issues with array accesses warnings/exceptions

* Change a number of "resource used as offset" notices to warnings,
which were previously missed.
* Throw the "res

Fix consistency issues with array accesses warnings/exceptions

* Change a number of "resource used as offset" notices to warnings,
which were previously missed.
* Throw the "resource used as offset" warning for isset() as well.
* Make array_key_exists() behavior with regard to different key
types consistent with isset() and normal array accesses. All key
types now use the usual coercions and array/object keys throw
TypeError.

Closes GH-4887.

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Convert "Illegal offset type" warnings to exceptions

Convert "cannot add element" warning to exception

Merge branch 'PHP-7.4'

Merge branch 'PHP-7.3' into PHP-7.4

Merge branch 'PHP-7.2' into PHP-7.3

Fix null-pointer deref in if stmt printing

Fixes OSS-Fuzz #17721.

Merge branch 'PHP-7.4'

Deprecate alternative array access syntax

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

Merge branch 'PHP-7.4'

* PHP-7.4:
Replace ZEND_ASSIGN_ADD (and others) by ZEND_ASSIGN_OP, ZEND_ASSIGN_DIM_OP, ZEND_ASSGIN_OBJ_OP and ZEND_ASSIGN_STATIC_PROP_OP

Replace ZEND_ASSIGN_ADD (and others) by ZEND_ASSIGN_OP, ZEND_ASSIGN_DIM_OP, ZEND_ASSGIN_OBJ_OP and ZEND_ASSIGN_STATIC_PROP_OP

Merge branch 'PHP-7.4'

Merge branch 'PHP-7.3' into PHP-7.4

Merge branch 'PHP-7.2' into PHP-7.3

Fix bugs in AST printer

Closes GH-4324.

Merge branch 'concatenation_precedence'

Merge branch 'deprecate_concat_add_sub' into PHP-8.4