Make dchecked_vector C++11 compatible.

Since GCC's C++14 ABI is incorrect, we need to drop GCC users back to
C++11. Since ART does not unconditionally use clang, it cannot
unconditionally use C++14 either.

This constructor for std::vector was added in C++14, so we need to
implement it ourselves.

Bug: http://b/25022512
Change-Id: Ib31a312c8c91fe6eccf24d59ef58f2fa8e634e1c