Change linkInModule to take a std::unique_ptr.

Passing in a std::unique_ptr should help find errors when the module
is used after being linked into another module.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255842 91177308-0d34-0410-b5e6-96231b3b80d8
15 files changed