llvm-project

48172d53 - [MemProf] Cache context nodes for callsite stack ids during matching (NFC) (#239822)

[MemProf] Cache context nodes for callsite stack ids during matching (NFC) (#239822) updateStackNodes and assignStackNodesPostOrder repeatedly looked up the context node for each stack id of each call being matched. Save the nodes in CallContextInfo when they are first looked up and use them throughout. The stack ids themselves are no longer saved, as they are available via each node's OrigStackOrAllocId. The sort of calls with the same last stack id now orders by those ids, and identical sequences are detected by comparing the node vectors. This efficiency improvement is leveraged in a follow on PR to avoid adding another round of context node lookups. Assisted-by: Gemini