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Chandler Carruth
44c85e0872
This uses a heuristic reserve to greatly reduce hashtable growth of the identifiers hashtable. The design of the hashtable itself is optimized around compact memory use and is especially slow to grow and so this has an outsized impact. The heuristic was computed using `scripts/source_stats.py` and looking at C++ codebases. We may want to periodically re-evaluate it as Carbon code emerges and we have better data on its distributions of tokens. This also required fixing the `Reserve` method on `CanonicalValueStore` that wasn't actually used anywhere and so didn't even compile correctly. I added it to the relevant unit test so it is at least compiled locally to its definition.