Try to fix buildbot error

Error is:

llvm/lib/Analysis/ScalarEvolution.cpp:3534:10: error: chosen constructor is explicit in copy-initialization
  return {UniqueSCEVs.FindNodeOrInsertPos(ID, IP), std::move(ID), IP};
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/../lib/gcc/aarch64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/tuple:479:19: note: explicit constructor declared here
        constexpr tuple(_UElements&&... __elements)
                  ^
1 error generated.

llvm-svn: 357324