[clang] DeducedTypes deduction kind fix and improvement (#186727) This is a small refactor of how DeducedType and it's derived types are represented. The different deduction kinds are spelled out in an enum, and how this is tracked is simplified, to allow easier profiling. How these types are constructed and canonicalized is also brought more in line with how it works for the other types. This fixes a crash reported here: https://github.com/llvm/llvm-project/issues/167513#issuecomment-3692962115
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