Include the source location in Closure names (#13550)

* Include the source location in Closure names

This change makes stack traces involving Closures, especially multiple
diffe

Include the source location in Closure names (#13550)

* Include the source location in Closure names

This change makes stack traces involving Closures, especially multiple
different Closures, much more useful, because it's more easily visible *which*
closure was called for a given stack frame.

The implementation is similar to that of anonymous classes which already
include the file name and line number within their generated classname.

* Update scripts/dev/bless_tests.php for closure naming

* Adjust existing tests for closure naming

* Adjust tests for closure naming that were not caught locally

* Drop the namespace from closure names

This is redundant with the included filename.

* Include filename and line number as separate keys in Closure debug info

* Fix test

* Fix test

* Include the surrounding class and function name in closure names

* Fix test

* Relax test expecations

* Fix tests after merge

* NEWS / UPGRADING

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Fix GH-8329 Print true/false instead of bool in error and debug messages (#8385)

Clean up calls to extension_loaded('json') in tests

These are no longer needed after https://wiki.php.net/rfc/always_enable_json

Closes GH-5637

Improve type error messages when an object is given

From now on, we always display the given object's type instead of just reporting "object".
Additionally, make the format of return typ

Improve type error messages when an object is given

From now on, we always display the given object's type instead of just reporting "object".
Additionally, make the format of return type errors match the format of argument errors.

Closes GH-5625

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Change argument error message format

Closes GH-5211

Make type error messages more consistent

Closes GH-5092

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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