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04ab82a806
SerializedPtrID, followed by the *differences* in IDs. The big idea is that most IDs will be just be 1 off from the previous (either that or NULL, which we encode as a difference if 0), so this will greatly reduce the encoding space for extra IDs to just 1 bit per pointer. So far this optimization reduces serialization of Carbon.h by only 1%, but we aren't using any abbreviations now in the Bitcode file to properly take advantage of this optimization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44199 91177308-0d34-0410-b5e6-96231b3b80d8