[llvm-commits] Optimization for SIGN_EXTEND on AVX and AVX2 - please review

[Demikhovsky, Elena]

I optimized the following SEXT pairs:
v8i8 -> v8i64
v8i8->v8i32
v4i8 ->v4i64
v4i16->v4i64


Please review. thanks.

- Elena


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