[LV] Ignore the cost of values that will not appear in the vectorized loop

VecValuesToIgnore holds values that will not appear in the vectorized loop.
We should therefore ignore their cost when VF > 1.

Differential Revision: https://reviews.llvm.org/D40883



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320463 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed