do not collect undef terms

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208237 91177308-0d34-0410-b5e6-96231b3b80d8
avoid segfaulting

*Quotient and *Remainder don't have to be initialized.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208238 91177308-0d34-0410-b5e6-96231b3b80d8