[ORC] Use insert rather than emplace.

Hopefully this will fix the build failure at
http://lab.llvm.org:8011/builders/llvm-clang-x86_64-expensive-checks-win/builds/9028

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@329944 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed