[NewGVN] replace emplace_back with push_back

emplace_back is not faster if it is equivalent to push_back. In this cases emplaced value had the
same type that the one stored in container. It is ugly and it might be even slower (see
Scott Meyers presentation about emplacement).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290685 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed