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[X86] Atom SSE shift-by-variable take 2uops/3uops not 1uop

Authored by RKSimon on Sep 30 2021, 4:28 AM.

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[X86] Atom SSE shift-by-variable take 2uops/3uops not 1uop

Based off the most recent llvm-exegesis captures (PR36895) and what Intel AoM / Agner / InstLatX64 reports as well.

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Committed
RKSimonOct 2 2021, 4:28 AM
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rGacb459574afc: [X86][Costmodel] Load/store i8 Stride=4 VF=32 interleaving costs
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