[ORC] Add a getRequestedSymbols method to MaterializationResponsibility.
This method returns the set of symbols in the target VSO that have queries
waiting on them. This can be used to make decisions about which symbols to
delegate to another MaterializationUnit (typically this will involve
delegating all symbols that have *not* been requested to another
MaterializationUnit so that materialization of those symbols can be
deferred until they are requested).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333684
91177308-0d34-0410-b5e6-
96231b3b80d8
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