[X86][ByteCode] Allow PSHUFB intrinsics to be used in constexpr #156612 (#163148) The PSHUFB instruction shuffles bytes within each 128-bit lane: for each control byte, if bit 7 is set, the output byte is zeroed; otherwise, the low 4 bits select a source byte (0–15) from the same lane. Note: _mm_shuffle_pi8 function had to change as __anyext128 had negative indices which are invalid in constant expression context. Fixes #156612
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