Revert "[SelectionDAGBuilder] Refactor GetRegistersForValue. NFCI."

This reverts commit r350841, as it actually had functional changes
and broke compilation. See PR40290.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350921 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed