[PATCH] Add possibility to preserve outdated debug info

[Dmitriy Matveev via llvm-commits]

Hello! This is a patch for issue described in
http://lists.llvm.org/pipermail/llvm-dev/2016-November/107482.html

Briefly: need an option to keep debug metadata even if version check fails.

---
 lib/Bitcode/Reader/BitcodeReader.cpp | 8 +++++++-
 lib/IR/Verifier.cpp                  | 3 ---
 2 files changed, 7 insertions(+), 4 deletions(-)
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