[Analysis] Add support for vscale in computeKnownBitsFromOperator
In ValueTracking.cpp we use a function called computeKnownBitsFromOperator to determine the known bits of a value. For the vscale intrinsic if the function contains the vscale_range attribute we can use the maximum and minimum values of vscale to determine some known zero and one bits. This should help to improve code quality by allowing certain optimisations to take place. Tests added here: Transforms/InstCombine/icmp-vscale.ll Differential Revision: https://reviews.llvm.org/D109883
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