https://llvm.org/doxygen/structDOTGraphTraits_3_01const_01CallsiteContextGraph_3_01DerivedCCG_00_01FuncTy_00_01CallTy_01_4_01_5_01_4.html
LLVM: DOTGraphTraits const CallsiteContextGraph DerivedCCG, FuncTy, CallTy * Struct Template...
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