[clang] [clang][analyzer] Simplify code of StreamChecker (NFC). (PR #79312)

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NagyDonat wrote:

Yes, the "common big set of arguments" is an annoying problem. Perhaps you could consider my solution in core.BitwiseShift where I introduced a "validator" class that holds all the common arguments as data members, so instead of helper functions you have helper methods that can all access the common arguments. (The checker callback constructs a validator, and calls its "main" method, which will call the others as needed)

https://github.com/llvm/llvm-project/pull/79312