[DEBUGINFO] Add flag for DWARF2 or less to use sections as references.
Summary:
Some targets does not support labels inside debug sections, but support
references in form `section +|- offset`. Patch adds initial support
for this. Also, this patch disables emission of all additional debug
sections that may have labels inside of it (like pub sections and
string tables).
Reviewers: probinson, echristo
Subscribers: JDevlieghere, llvm-commits
Differential Revision: https://reviews.llvm.org/D43627
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@326328
91177308-0d34-0410-b5e6-
96231b3b80d8
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