Revert "debuginfo: Use symbol difference for CU length to simplify assembly reading/editing"

Temporarily reverts commit r348806 due to strange asm compilation issues in certain modes (combination of asan+cuda+other things). Will provide repro soon.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348898 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed