tree 044329b53bee63d7bcc65112c5a90238401ea556
parent c4e6c1b2b02082791c4b8f120d2c07be919b5506
author Bruno De Fraine <brunodf@synopsys.com> 1705503553 +0100
committer Copybara-Service <copybara-worker@google.com> 1705503677 -0800

[AST] Don't merge memory locations in AliasSetTracker (#65731)

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.

GitOrigin-RevId: 656bf13004d62b8f8360d8d496bb1e6e08407c22