This patch deprecates DenseMap::getOrInsertDefault in favor of
DenseMap::operator[], which does the same thing, has been around
longer, and is also a household name as part of std::map and
std::unordered_map.
Note that DenseMap provides several equivalent ways to insert or
default-construct a key-value pair:
- operator[Key]
- try_emplace(Key).first->second
- getOrInsertDefault(Key)
- FindAndConstruct(Key).second
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