AsmPrinter: Take DIEValueList in some DwarfUnit API, NFC

Take `DIEValueList` instead of `DIE` so that `DIEBlock` and `DIELoc` can
stop inheriting from `DIE` in a future commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243855 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed