[ThinLTO] Add GraphTraits for FunctionSummaries

Add GraphTraits definitions to the FunctionSummary and ModuleSummaryIndex classes. These GraphTraits will be used to construct find SCC's in ThinLTO analysis passes.

Third attempt - moved function from lambda to static function due to build failures.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@325506 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed