[x265] How can I enable the AVX2 version of DCT and IDCT?

[Ximing Cheng]

I read the source code of the /source/common/vec/dct-sse3.cpp and I found
the comments said "Note: We have AVX2 assembly for these functions, but
since AVX2 is still somewhat rare on end-user PCs we still compile and link
these SSE3 intrinsic SIMD functions".

But now both my PC and server support Intel AVX2 instruction set. If I want
to compile these functions with AVX2 assembly, where to find the AVX2
version of source code of these functions?

Thanks!
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