keccakf_mul micro-optimization
__always_inline reciprocal_remainder64, ICC doesn't inline it otherwise
wildkeccak: avx2 support for xor operations, verified in Intel® Software Development Emulator
Merge remote-tracking branch 'upstream/master'
Merge pull request #3 from otila/master

wildkeccak avx2 support, also add back non-optimized xor code for CPUs without SSE2 from otila