clang: do not issue bogus warnings about integer manipulation in hash functions with fsanitize=undefined/integer (#2965)

With -fsanitize=integer every over/under-flowing integer manipulation triggers a warning.
This is extremely useful as it allows to find some non-obvious bugs such as

    for(size_t i = 0; i < N - 1; i++) { ... }

But it comes with a lot of false positives, for instance with every hash function
doing shifting on unsigned integer. Random number generators are also often detected
with this sanitizer.

This marks a few of these functions as safe in this case.

Co-authored-by: Martin Hořeňovský <martin.horenovsky@gmail.com>

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