tree 03c39df6e5390d3eddcf5efac79f194c622f7a33
parent 9b195dc3ef66de2c1ff0048822b24a322ec3c52a
author Owen Rodley <orodley@google.com> 1743398195 +1100
committer Owen Rodley <orodley@google.com> 1754351681 +1000

Store GUIDs in metadata

See https://discourse.llvm.org/t/rfc-keep-globalvalue-guids-stable/84801
for context.

This takes the existing AssignGUID pass from CtxProfAnalysis, and runs
it by default, at the appropriate stages of the LTO pipeline. It also
changes GlobalValue::getGUID() to retrieve the GUID from the metadata
instead of computing it.

We don't yet have the supporting downstream changes to make a dedicated
GUID table in bitcode, nor do we use the metadata as part of ThinLTO --
it retains its existing mechanisms of recomputing GUIDs from separately
saved data. That will be changed later.