The documentation for the AVX2 intrinsic _mm256_shuffle_epi8 in the User and Reference Guide for the Intel C++ Compiler 15.0 states that the corresponding AVX2 intrinsic is VPALIGNRB:
https://software.intel.com/en-us/node/523985
However, the Intel 64 and IA-32 Architectures Software Developer's Manual lists the corresponding AVX2 instruction as VPALIGNR.