fc5cf50e89
This class used to serve a few useful purposes: * Allowed containing a null DictionaryAttr * Provided some simple mutable API around a DictionaryAttr The first of which is no longer an issue now that there is much better caching support for attributes in general, and a cache in the context for empty dictionaries. The second results in more trouble than it's worth because it mutates the internal dictionary on every action, leading to a potentially large number of dictionary copies. NamedAttrList is a much better alternative for the second use case, and should be modified as needed to better fit it's usage as a DictionaryAttrBuilder. Differential Revision: https://reviews.llvm.org/D93442
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