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There are a few problems with this function: * It returns uint64_t instead of int64_t, which is different from core Dart library function identityHashCode() * Dart_IdentityHash truncates negative Mint and Bigint values to 0, while negative Smi values are converted to uint64_t. The Dart_IdentityHash function is not used, so we decided to remove it instead of fixing these problems. R=zra@google.com Review-Url: https://codereview.chromium.org/2980043002 .