curl / curl / 11555

71%

master: 37%

Pull #4350

travis-ci

adc: fix undefined behaviour and open up for gcc and clang optimization

The undefined behaviour is annoying when running fuzzing with
sanitizers. The codegen is the same, but the meaning is now
not up for dispute. See https://cppinsights.io/s/516a2ff4

By incrementing the pointer first, both gcc and clang recognize this
as a bswap and optimizes it to a single instruction.
See https://godbolt.org/z/994Zpx

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