If a linkonce_odr dtor/ctor is identical to another one, just rauw.

Unlike an alias a rauw is always safe, so we don't need to avoid this
optimization when the replacement is not know to be available in every TU.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194288 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed