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[SVE] Fix invalid usages of getNumElements in ShuffleVectorInstruction

Authored by ctetreau on Jun 16 2020, 2:18 PM.



Fix invalid usages of getNumElements identified by test case

changesLength: Since the length of the llvm::SmallVector shufflemask
is related to the minimum number of elements in a scalable vector, it is
fine to just get the Min field of the ElementCount

isIdentityWithExtract: Since it is not possible to express the mask
needed for this pattern for scalable vectors, we can just bail before
calling getNumElements()

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