Reduce YIELD_FROM specialization

Generator delegation is a complex compound operation, it does not
make a lot of sense to optimize refcounting here to this degree.

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.

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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Avoid extra specialization for cold opcodes

Added specialization for comparison instructions and QM_ASSIGN

Slit INC/DEC opcodes into hot/cold parts and remove specialized versioins for LONG_OR_DOUBLE.

Merge branch 'PHP-7.3' into PHP-7.4

* PHP-7.3:
Fixed incorrect specialization (missed IS_INDIRECT handling)

Merge branch 'PHP-7.2' into PHP-7.3

* PHP-7.2:
Fixed incorrect specialization (missed IS_INDIRECT handling)

Separate "cold" parts of comparison instructions

Separate "cold" parts of binary op instructions

Remove duplicated code for (PRE|POST)_DEC_(OBJ|STATIC_PROP) opcodes

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.

Prevent generation of specialized ZEND_ASSIGN_OP_..._STATIC_PROP handlers, that call unspecialized helper, anyway.

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

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()