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d134b0cae3
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>