[TargetTransformInfo] Add pow2 analysis for scalar constants

Add ConstantInt analysis to getOperandInfo so we get more realistic div/rem expansion costs comparable to the vector costs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336827 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed