Method isLoopHeader

GPCS4/Graphics/Gcn/ControlFlowGraph/GcnLoopInfo.cpp:141–146

	}

	bool GcnLoopInfo::isLoopHeader(GcnCfgVertex vtx) const
	{
		auto loop = getLoop(vtx);
		return (loop != nullptr) && 
			   (loop->getHeader() == vtx);
	}

	std::unordered_set<GcnCfgVertex> GcnLoopInfo::findLoopHeaders()
	{