[InstCombine] remove redundant test

This test was apparently checking for 2 independent folds, but we have
plenty of tests for those individual folds already. We are lacking
vector tests, however, because we don't have the shift folds for vectors.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284243 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed