Fix MSVC build for r357749

MSVC found the bare "make_unique" invocation ambiguous (between std::
and llvm:: versions). Explicitly qualifying the call with llvm:: should
hopefully fix it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357750 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed