[ORC] Replace SymbolResolvers in the new ORC layers with search orders on VSOs.
A search order is a list of VSOs to be searched linearly to find symbols. Each
VSO now has a search order that will be used when fixing up definitions in that
VSO. Each VSO's search order defaults to just that VSO itself.
This is a first step towards removing symbol resolvers from ORC altogether. In
practice symbol resolvers tended to be used to implement a search order anyway,
sometimes with additional programatic generation of symbols. Now that VSOs
support programmatic generation of definitions via fallback generators, search
orders provide a cleaner way to achieve the desired effect (while removing a lot
of boilerplate).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337593 91177308-0d34-0410-b5e6-96231b3b80d8
15 files changed