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656bf13004
This changes the AliasSetTracker to track memory locations instead of pointers in its alias sets. The motivation for this is outlined in an RFC posted on LLVM discourse: https://discourse.llvm.org/t/rfc-dont-merge-memory-locations-in-aliassettracker/73336 In the data structures of the AST implementation, I made the choice to replace the linked list of `PointerRec` entries (that had to go anyway) with a simple flat vector of `MemoryLocation` objects, but for the `AliasSet` objects referenced from a lookup table, I retained the mechanism of a linked list, reference counting, forwarding, etc. The data structures could be revised in a follow-up change. |
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