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Consider existence of EETypes and metadata for typeof checks (#107347)
The problem was that when we optimize `typeof(Foo) == somevalue` checks, we were looking at the presence of a constructed `MethodTable` of `Foo` in the whole program view. If it didn't exist, we'd declare the equality comparison can't succeed. There is however an edge case where someone could obtain a `System.Type` representing a type by browsing the reflection metadata. Such `System.Type` might not have a workable constructed `MethodTable`, but should still compare equal to the `typeof`. An example of when this could happen is when the type is used in a custom attribute metadata blob - such type may even have no `MethodTable` at all. The fix is to look not just at `MethodTable` but also at the metadata for the type.
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