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4ddb0b7f8e
Remove `WithCachedTypeInfo::stable_hash`. We store a stable hash value in the most common interned values (e.g. types, predicates, regions). This is 16 bytes of data. - In non-incremental builds it's a straightforward performance loss: the stable hash isn't computed or used, and the 16 bytes of space goes to waste (but it still gets hashed when interning). - In incremental builds it avoids some hashing but doesn't seem to actually be a genuine performance win, and the complexity doesn't seem worth it. r? @oli-obk