[InlineCost] Add a test case for GEP cost

The added test case is to check whether the simplified value is passed to
getGEPCost().

Differential Revision: https://reviews.llvm.org/D33779

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304454 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed