Benchmark CBool

[curiousleo]

CBool is not being benchmarked right now in bench/Main.hs.

Just like the CBool tests, those benchmarks probably need to be guarded by

#if __GLASGOW_HASKELL >= 802
...
#endif

[lehins]

@curiousleo I don't think adding more CPP is a good idea here. Benchmarking and testing another newtype wrapper around Word8 will not buy us that much for it too be worth it.

Both of its implementation and definition is identical to CUChar, so if anyone would like to see the numbers they can look at that type instead.