Add a GUIDLIST table to bitcode #139497
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Add a GUIDLIST table to bitcode #139497
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See https://discourse.llvm.org/t/rfc-keep-globalvalue-guids-stable/84801
for context.
GUIDs are stored in metadata, so generally don't need to be explicitly
copied into bitcode. But function importing loads functions lazily, importing
metadata only along with the function body. We need the GUID before
we've imported the body. This side table will fulfil this requirement.
This PR only reads/writes the table, it doesn't yet use it for building the
module summary index.