Upstream regression: compiler refuses to convert cint to uint32

[mratsim]

See: https://github.com/mratsim/constantine/actions/runs/11034017591/job/30646539242?pr=468

The flow:

Threadpool has a cint numThreads https://github.com/mratsim/constantine/blob/65147ed815d96fa94a05d307c1d9980877b7d0e8/constantine/threadpool/threadpool.nim#L188-L195

It is passed to pseudoRandomPermutation which only accepts an uint32 https://github.com/mratsim/constantine/blob/65147ed815d96fa94a05d307c1d9980877b7d0e8/constantine/threadpool/threadpool.nim#L656-L667 There should be an error but there aren't, I assume because it's an iterator.

The input is cast to uint32 https://github.com/mratsim/constantine/blob/65147ed815d96fa94a05d307c1d9980877b7d0e8/constantine/threadpool/threadpool.nim#L121-L122

And then passed to a function that only accepts unsigned integers with no problem https://github.com/mratsim/constantine/blob/65147ed815d96fa94a05d307c1d9980877b7d0e8/constantine/platforms/bithacks.nim#L156-L159

Forwarded to a dispatcher https://github.com/mratsim/constantine/blob/65147ed815d96fa94a05d307c1d9980877b7d0e8/constantine/platforms/bithacks.nim#L97-L105

And to the final builtins, depending on Clang/GCC vs ICC/MSVC, the result is a cint that is converted back to T in the previous proc https://github.com/mratsim/constantine/blob/65147ed815d96fa94a05d307c1d9980877b7d0e8/constantine/platforms/intrinsics/bitops.nim#L25-L36 https://github.com/mratsim/constantine/blob/65147ed815d96fa94a05d307c1d9980877b7d0e8/constantine/platforms/intrinsics/bitops.nim#L82-L90

Notice the error Error: type mismatch: got 'cint' for 'log2_c_compiler_vartime(n)' but expected 'uint32'

[mratsim]

Actually already fixed in #459 was working on an unsynced master branch.