[AggressiveInstCombine] add test for rotate insertion point; NFC

As noted in D55604 - we need a test to make sure that the new intrinsic
is inserted into a valid position.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349347 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed