The jit needs to recover class handles in order to devirtualize and
do other type-based optimizations. This change allows the jit to find
the type for more trees: in particular, helper calls, intrinsics, and
expanded static field accesses.

We don't want to optimize special methods that are used to inform crossgen
about desirable generic instantiations. `CommonlyUsedGenericInstantiations`
was already annotated but `CommonlyUsedWinRTRedirectedInterfaceStubs` wasn't.

Also because `RuntimeType` is sealed calls through types are now often
devirtualized. Name lookups on types are frequent, especially on error paths.
The method `GetCachedName` looks like an attractive inline but simply expands
into a larger sequence of two other calls. So block it from being inlined.