Split out a helper `printValues()` for printing `DIEBlock` and `DIELoc`,
instead of relying on `DIE::print()`. The shared code was actually
fairly small there. No functionality change intended.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243856 91177308-0d34-0410-b5e6-96231b3b80d8