Added new tensorflow::gtl::FlatMap and tensorflow::gtl::FlatSet classes.

Mostly drop-in replacements for std::unordered_map and std::unordered_set,
but much faster (does not do an allocation per entry, and represents
entries in groups of 8 in a flat array, which is much more cache efficient).

Benchmarks not included in this cl show about 3X to 5X performance
improvements over the std::unordered_{set,map} for many kinds of
common maps e.g. std::unordered_mapmap<int64, int64> or
std::unordered_map<string, int64>.
Change: 137401863

0 files changed, 0 insertions, 0 deletions