PHPStan autoloader mechanics invoked for case which does not use autoloading at runtime #14976

Bug report

the PR at phpstan/phpstan-src#4003 adds a end-to-end test which fails atm.

runtime: run php real-world.php
you see the program runs, without the custom autoloader of e2e/bug-12972b/autoloader.php beeing invoked.
all involved classes are autoloaded by the composer class loader. the custom class loader is not invoked for \other12972\MyClass::class.

static analysis time: run ../../bin/phpstan analyze

you see PHPStan invokes the custom class loader for class \other12972\MyClass::class, which does not happen at regular runtime. the composer class loader is not invoked for \other12972\MyClass::class (like it is at runtime).

because of the difference in autoloading functions order in runtime vs. analysis time we see errors which cannot happen at runtime

Code snippet that reproduces the problem

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Expected output

phpstan should not analyze the code as if the autoloader was invoked (as we saw it isn't at runtime)

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