Don't print preload warning for non-top-level classes

Dynamically declared classes categorically do not get linked during
preloading, even if all their dependencies are known. The warnin

Don't print preload warning for non-top-level classes

Dynamically declared classes categorically do not get linked during
preloading, even if all their dependencies are known. The warning
is misleading in this case, and there isn't anything the user can
do to address it.

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Migrate skip checks to --EXTENSIONS--, p3

For rationale, see #6787

Extensions migrated in part 3:
* ftp
* gmp
* iconv
* opcache
* shmop

Review the usage of apostrophes in error messages

Closes GH-5590

Improve generated names for anonymous classes

In order of preference, the generated name will be:

new class extends ParentClass {};
// -> ParentClass@anonymous
n

Improve generated names for anonymous classes

In order of preference, the generated name will be:

new class extends ParentClass {};
// -> ParentClass@anonymous
new class implements FirstInterface, SecondInterface {};
// -> FirstInterface@anonymous
new class {};
// -> class@anonymous

This is intended to display a more useful class name in error messages
and stack traces, and thus make debugging easier.

Closes GH-5153.

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Remove support for preloading on Windows

Due to ASLR restrictions, preloading on Windows does not work with
any code that has preloading dependencies on internal classes.
This effect

Remove support for preloading on Windows

Due to ASLR restrictions, preloading on Windows does not work with
any code that has preloading dependencies on internal classes.
This effectively makes it unusable for any non-trivial codebase.

Instead of pretending like preloading is going to work, only to
make people realize that it really doesn't once they get beyond
a dummy example, we disable support for preloading on Windows
entirely.

Closes GH-4999.

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Fixed bug #78937 (Preloading unlinkable anonymous class can segfault)