Revert "DebugInfo: Assume an absence of ranges or high_pc on a CU means the CU is empty (devoid of code addresses)"

This reverts commit r349333. It caused internal test to fail. I have
sent more information to the author.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349353 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed