remove this testcase. It isn't testing loop rotate, it is testing all

remove this testcase.  It isn't testing loop rotate, it is testing all
of -std-compile-opts and is now failing because other passes are generating
IR that looks different to input of loop rotate.  Devang, please
introduce a testcase that only runs loop rotate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50136 91177308-0d34-0410-b5e6-96231b3b80d8