Revert "Improve TableGen performance of -gen-dag-isel (motivated by X86 backend)"

It breaks a lot of bots due to missing "__iterator_category".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313651 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed