[ORC] Fix a missing move in ce2207ab.
This should fix the build failure at http://lab.llvm.org:8011/builders/clang-cmake-x86_64-sde-avx512-linux/builds/32524 and others.
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This should fix the build failure at http://lab.llvm.org:8011/builders/clang-cmake-x86_64-sde-avx512-linux/builds/32524 and others.