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A SmallSet starts with fixed storage that it uses in the simplest
possible way (linear scan, no sorting). If it exceeds a size then it
starts using a normal std::set. So for small amounts of data it
avoids allocation and any other overhead.
This adds a unit test and also uses it in LocalGraph which provides
a large amount of additional coverage.
I also changed an unrelated data structure from std::map to
std::unordered_map which I noticed while doing profiling in
LocalGraph. (And a tiny bit of additional refactoring there.)
This makes LocalGraph-using passes like ssa-nomerge and
precompute-propagate 10-15% faster on a bunch of real-world
codebases I tested.
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