[ADT] Move llvm::identity into IndexedMap (NFC) (#164568) This patch moves llvm::identity to IndexedMap for two reasons: - llvm::identity is used only IndexedMap. - llvm::identity is not suitable for general use as it is not quite the same as std::identity despite the comments in identity.h. Also, this patch renames the class to IdentityIndex and places it in the "detail" namespace.
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