Code cleanup: Remove std::move() around xvalue (NFC)

Remove std::move() around xvalue so that copy elision is eligible.
In case that copy elision is not appliable, the c++ standard also
guarantees the move semantics on xvalue.  Thus, it is not necessary
to wrap Args with std::move.

This also silence a warning since r240345.

llvm-svn: 240355
1 file changed