Fix $x = (bool)$x; for undefined with opcache

And `$x = !$x`

Noticed while working on GH-4912

The included test would not emit undefined variable errors in php 8.0
with

Fix $x = (bool)$x; for undefined with opcache

And `$x = !$x`

Noticed while working on GH-4912

The included test would not emit undefined variable errors in php 8.0
with opcache enabled. The command used:

```
php -d zend_extension=opcache.so --no-php-ini -d error_reporting=E_ALL \
-d opcache.file_cache= -d opcache.enable_cli=1 test.php
```

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Fix leak on static method call on non-existent class

Fix use-after-free of immediately invoked closure with extra args

Fixed incorrect specialization (missed IS_INDIRECT handling)

Fixed bug #76534 (PHP hangs on 'illegal string offset on string references with an error handler)

Fixed user-opcode support

Fixed bug #75786

SEND_UNPACK on iterators was duplicating references in-place,
which effectively leaks the original value and causes an off-by-one
refcount on the duplicated value.

Fixed bug #75786

SEND_UNPACK on iterators was duplicating references in-place,
which effectively leaks the original value and causes an off-by-one
refcount on the duplicated value.

Replace this with a deref, as an actual duplication is not even
needed in this case.

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year++

year++

Fixed #74862: Unable to clone instance when private __clone defined

Even though __clone was implemented as private and called only from
parent class, child extending class instance could

Fixed #74862: Unable to clone instance when private __clone defined

Even though __clone was implemented as private and called only from
parent class, child extending class instance could not be cloned.

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Fixed attempt to free invalid structure (result of ROPE_INIT is not a zval)

Req #74963 (Improved error message on fetching property of non-object)

Separate the fast-patch

Don't reuse compare_function operands

If the same zval is used for the result and one operand, then the
function thinks it is responsible for freeing the value in case of
a type conv

Don't reuse compare_function operands

If the same zval is used for the result and one operand, then the
function thinks it is responsible for freeing the value in case of
a type conversion.

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gc_check_possible_root() may throw exception.

Separate ISSET_ISEMPTY_CV/UNSET_CV from ISSET_ISEMPTY_VAR/UNSET_VAR

Revert "Avoid run-time checks performed at compile-time."

This reverts commit 8fe47a47cf30eb3bf50a5cdb4e07f6fa135d21c7.

Split zend_init_execute_data() into zend_init_func_execute_data() and zend_init_code_execute_data()

Remove unused variable op2. It is redeclared later.

Fix FE_FETCH_* exception check

Only applying this for 7.2, because handling this would be ugly
under the old retval freeing semantics.

Fixed bug #74810

And also did some general cleanup in ZEND_FUNC_GET_ARGS.

Added specialized FE_FETCH_R handler for iteration over array

FE_RESER/FE_FETCH optimisation

VM refactoring, to avoid passing "execute_data" into helper functions that can access it using global register variable.

Moved "Using $this when not in object context" exception code into single VM helper.