Revert r226242 - Revert Revert Don't create new comdats in CodeGen

This breaks AddressSanitizer (ninja check-asan) on Windows

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226251 91177308-0d34-0410-b5e6-96231b3b80d8
15 files changed