[yul] Functions: Remove dependency on AST ID.

libsolidity/codegen/ir/IRGenerationContext.h

@@ -152,6 +152,14 @@ public:
 	bool inlineAssemblySeen() const { return m_inlineAssemblySeen; }
 	void setInlineAssemblySeen() { m_inlineAssemblySeen = true; }
 
+	/// @returns the runtime ID to be used for the function in the dispatch routine
+	/// and for internal function pointers.
+	/// @param _requirePresent if false, generates a new ID if not yet done.
+	uint64_t internalFunctionID(FunctionDefinition const& _function, bool _requirePresent);
+	/// Copies the internal function IDs from the @a _other. For use in transferring
+	/// function IDs from constructor code to deployed code.
+	void copyFunctionIDsFrom(IRGenerationContext const& _other);
+
 	std::map<std::string, unsigned> const& sourceIndices() const { return m_sourceIndices; }
 
 private:
@@ -191,6 +199,8 @@ private:
 	/// the code contains a call via a pointer even though a specific function is never assigned to it.
 	/// It will fail at runtime but the code must still compile.
 	InternalDispatchMap m_internalDispatchMap;
+	/// Map used by @a internalFunctionID.
+	std::map<int64_t, uint64_t> m_functionIDs;
 
 	std::set<ContractDefinition const*, ASTNode::CompareByID> m_subObjects;
 };