[PATCH] Teach builtin clz, ctz, and popcount to be const

[mail at justinbogner.com]

Joerg Sonnenberger <joerg at britannica.bec.de> writes:
>> Do you mean something like this?
>
> Yes, with a few more (non-trivial) test vectors.

Here's a version with some more interesting tests. I've also opted to
treat __builtin_clz(0) as non-const as per Richard's suggestion.

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