a51829913d
Introduce support for mutable storage in the StorageUniquer infrastructure. This makes MLIR have key-value storage instead of just uniqued key storage. A storage instance now contains a unique immutable key and a mutable value, both stored in the arena allocator that belongs to the context. This is a preconditio for supporting recursive types that require delayed initialization, in particular LLVM structure types. The functionality is exercised in the test pass with trivial self-recursive type. So far, recursive types can only be printed in parsed in a closed type system. Removing this restriction is left for future work. Differential Revision: https://reviews.llvm.org/D84171
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