Fix CallMap for Reflection(Union|Intersection)Type::getTypes()

[BenMorel]

Trying to fix #9079, I looked at stubs as advised in #9079 (comment):

Reflection classes were added in stubs (which overrides callmap) recently, so you may need to dig into that instead

But the correct type was already there:

    class ReflectionUnionType extends ReflectionType {
        /** @return non-empty-list<ReflectionNamedType|ReflectionIntersectionType> */
        public function getTypes(): array {}
    }

https://github.com/vimeo/psalm/blob/5.4.0/stubs/Php82.phpstub

So just in case, I tried to fix the CallMaps as well (this PR), but Psalm still reports the same false positive with the code in the original issue:

docblock-defined type ReflectionNamedType does not contain ReflectionIntersectionType

Any idea?

[orklah]

The issue seems to come from a wrong order when Psalm loads stubs. On my computer, the PHP80 stub is loaded last. We had a discussion about the way those stubs are loaded here: #8722 (comment)

I think we introduced (or revealed) an issue here.

Could you try to take a look at how those stubs are loaded to see if we can restore the correct order?

/cc @weirdan @Ocramius