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For the power9 CPU, vector operations consume a pair of execution units rather than one execution unit like a scalar operation. Update the target transform cost functions to reflect the higher cost of vector operations when targeting Power9. Patch by RolandF. Differential revision: https://reviews.llvm.org/D55461 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@352261 91177308-0d34-0410-b5e6-96231b3b80d8