Merge branch 'PHP-8.0'

* PHP-8.0:
Fixed bug #80900

Introduce pseudo-keyword ZEND_FALLTHROUGH

And use it instead of comments

Support prototypes in call graph

Even if we don't know the exact method being called, include it
in the call graph with the is_prototype flag. In particular, we
can still make use of

Support prototypes in call graph

Even if we don't know the exact method being called, include it
in the call graph with the is_prototype flag. In particular, we
can still make use of return types from prototype methods, as
PHP 8 makes LSP violations a hard error.

Most other places are adjusted to skip calls with !is_prototype.
Maybe some of them would be fine, but ignoring them is conservative.

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Handle warnings during sccp function evaluation

Some upcoming changes like https://wiki.php.net/rfc/deprecate_null_to_scalar_internal_arg
will make it somewhat inconvenient to determine

Handle warnings during sccp function evaluation

Some upcoming changes like https://wiki.php.net/rfc/deprecate_null_to_scalar_internal_arg
will make it somewhat inconvenient to determine whether a given
function invocation will generate a diagnostic. Rather than trying
to exclude this in advance, call the function with diagnostics
suppressed, and check whether anything was thrown.

This adds a new EG flag that is kept specific to the SCCP use-case.
This does not use the error_cb hook as it is a (non-TLS) global,
and doesn't fully suppress error handling besides.

Test this by removing the in advance checks for implode and array_flip.

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Add support for string keys in array unpacking

This adds support for:

$array1 = ['a' => 1, 'b' => 2];
$array2 = ['b' => 3, 'c' => 4];
$array = [...$array1, ...$a

Add support for string keys in array unpacking

This adds support for:

$array1 = ['a' => 1, 'b' => 2];
$array2 = ['b' => 3, 'c' => 4];
$array = [...$array1, ...$array2];
// => ['a' => 1, 'b' => 3, 'c' => 4]

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

Closes GH-6584.

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Move optimizer into core

This only moves the files, adjusts the build system, exports APIs
and does minor fixups to make sure the code builds.

This does not yet try to make the

Move optimizer into core

This only moves the files, adjusts the build system, exports APIs
and does minor fixups to make sure the code builds.

This does not yet try to make the optimizer usable independently
of opcache.

Closes GH-6642.

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