[Clang] remove redundant uses of dyn_cast (NFC) (#189106) This removes dyn_cast invocations where the argument is already of the target type (including through subtyping). This was created by adding a static assert in dyn_cast and letting an LLM iterate until the code base compiled. I then went through each example and cleaned it up. This does not commit the static assert in dyn_cast, because it would prevent a lot of uses in templated code. To prevent backsliding we should instead add an LLVM aware version of https://clang.llvm.org/extra/clang-tidy/checks/readability/redundant-casting.html (or expand the existing one).
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