llvm-project

a89a5936 - [CFI] Refactor `CfiFunctionIndex` to externalize GUID calculation (#201635)

[CFI] Refactor `CfiFunctionIndex` to externalize GUID calculation (#201635) In preparation for PR #201370 - the goal is to decouple CFI from _how_ ThinLTO computes its GUIDs, and enable PR #184065 (for this [RFC](https://discourse.llvm.org/t/rfc-keep-globalvalue-guids-stable/84801)). This PR just changes APIs and the internal implementation of CfiFunctionIndex, the subsequent one (201370) actually propagates GUIDs through metadata. It's _almost_ NFC - the YAML format does change though.