[CostModel][X86] Add costs for multiply-by-pow2 constants
These are folded to left shifts in the backend. We should be able to extend this for multiply-by-negpow2 after D111968 has landed to resolve PR51436
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These are folded to left shifts in the backend. We should be able to extend this for multiply-by-negpow2 after D111968 has landed to resolve PR51436