Reduce ZEND_THROW specialization

Throwing is very expensive due to the need of gathering the backtrace,
so it makes little sense to optimize refcounting to this degree.

Change ZEND_RECV and ZEND_RECV_VARIADIC to use extended_value for cache slot (instead of op2), to be consistent with ZEND_RECV_INIT.

Avoid over-specialization

Avoid references in TMP var

Make sure we deref the OBJ_IS result, because we store it in a TMP
var, which is not allowed to contain references and will cause
assertion failures in th

Avoid references in TMP var

Make sure we deref the OBJ_IS result, because we store it in a TMP
var, which is not allowed to contain references and will cause
assertion failures in the unspecialized VM.

This also partially reverts fd463a9a6078074f8f648982b42bdd14423fb614,
which merged the TMP and VAR specializations of COALESCE to work
around this bug.

An alternative would be to change the result type of OBJ_IS back
to VAR.

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Use run-time cache to avoid repeatable hash lookups when creating anonymous functions and classes

ZEND_DECLARE_ANON_CLASS doesn't need to skip anything now. It's immediatelly followed by ZEND_NEW.

Separate "cold" parts of comparison instructions

Separate "cold" parts of binary op instructions

Fixed opcode description

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

Improve zend_binary_assign_op helpers.
Reorder opcode numbers to make ADD-POW and ASSIGN_ADD-ASSIGN_POW opcodes sequencional.

Optimization of INC/DEC helpers

Reduce overhead of delayed early binding

Register class before fetching parent

We want the class declaration to be available while compiling the
parent class.

Don't specialize "cold" handlers

Removed useless specialization. Specialized handlers called not specialized helpers.

Implement spread operator in arrays

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

Closes GH-3640.

Avoid useless code duplication, because of unused specialization

Adios, yearly copyright ranges

Implement ??= operator

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

$a ??= $b is $a ?? ($a = $b), with the difference that $a is only
evaluated once, to the degree

Implement ??= operator

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

$a ??= $b is $a ?? ($a = $b), with the difference that $a is only
evaluated once, to the degree that this is possible. In particular
in $a[foo()] ?? $b function foo() is only ever called once.
However, the variable access themselves will be reevaluated.

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Implement typed properties

RFC: https://wiki.php.net/rfc/typed_properties_v2

This is a squash of PR #3734, which is a squash of PR #3313.

Co-authored-by: Bob Weinand <bobwe

Implement typed properties

RFC: https://wiki.php.net/rfc/typed_properties_v2

This is a squash of PR #3734, which is a squash of PR #3313.

Co-authored-by: Bob Weinand <bobwei9@hotmail.com>
Co-authored-by: Joe Watkins <krakjoe@php.net>
Co-authored-by: Dmitry Stogov <dmitry@zend.com>

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Implement ZEND_ARRAY_KEY_EXISTS opcode to speed up array_key_exists()

Update email addresses. We're still @Zend, but future proofing it...

Keep information about unresolved interfaces in zend_class_entry->interface_names.
Move interface implementation code into ZEND_DECLARE_*CLASS opcodes.
Remove ZEND_ADD_INTERFACE and ZEND_VER

Keep information about unresolved interfaces in zend_class_entry->interface_names.
Move interface implementation code into ZEND_DECLARE_*CLASS opcodes.
Remove ZEND_ADD_INTERFACE and ZEND_VERIFY_ABSTRACT_CLASS opcodes.

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Replace zend_class_entry->traits by persistent zend_class_entry->trait_names.
Move trait binding code into ZEND_DECLARE_*CLASS opcodes.
Remove ZEND_ADD_TRIAIT and ZEND_BIND_TRAITS opcodes.