Revert "[SelectionDAG] Consolidate (t|T)ransferDbgValues methods, NFC."

This reverts commit r318448. It looks like some of the asserts need to
be weakened.

http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-autoconf/builds/16296

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318455 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed