[NFC][LSR] Cleanup Cost API

Create members for Loop, ScalarEvolution, DominatorTree,
TargetTransformInfo and Formula.

Differential Revision: https://reviews.llvm.org/D58389


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356131 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed