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Commit 34659de5 authored by Simon Pilgrim's avatar Simon Pilgrim
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[InstCombine][X86] simplifyX86immShift - convert variable in-range vector... 

[InstCombine][X86] simplifyX86immShift - convert variable in-range vector shift by scalar amounts to generic shifts (PR40391)

The sll/srl/sra scalar vector shifts can be replaced with generic shifts if the shift amount is known to be in range.

This also required public DemandedElts variants of llvm::computeKnownBits to be exposed (PR36319).
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