[modules] "Specialize" a function by actually specializing a function template

rather than by adding an overload and hoping that it's declared before the code
that calls it. (In a modules build, it isn't.)

llvm-svn: 207133

llvm/include/llvm/CodeGen/EdgeBundles.h

@@ -59,11 +59,6 @@ private:
   void getAnalysisUsage(AnalysisUsage&) const override;
 };
 
-/// Specialize WriteGraph, the standard implementation won't work.
-raw_ostream &WriteGraph(raw_ostream &O, const EdgeBundles &G,
-                        bool ShortNames = false,
-                        const Twine &Title = "");
-
 } // end namespace llvm
 
 #endif

llvm/lib/CodeGen/EdgeBundles.cpp

@@ -69,15 +69,11 @@ bool EdgeBundles::runOnMachineFunction(MachineFunction &mf) {
   return false;
 }
 
-/// view - Visualize the annotated bipartite CFG with Graphviz.
-void EdgeBundles::view() const {
-  ViewGraph(*this, "EdgeBundles");
-}
-
 /// Specialize WriteGraph, the standard implementation won't work.
-raw_ostream &llvm::WriteGraph(raw_ostream &O, const EdgeBundles &G,
-                              bool ShortNames,
-                              const Twine &Title) {
+template<>
+raw_ostream &llvm::WriteGraph<>(raw_ostream &O, const EdgeBundles &G,
+                                bool ShortNames,
+                                const Twine &Title) {
   const MachineFunction *MF = G.getMachineFunction();
 
   O << "digraph {\n";
@@ -95,3 +91,8 @@ raw_ostream &llvm::WriteGraph(raw_ostream &O, const EdgeBundles &G,
   O << "}\n";
   return O;
 }
+
+/// view - Visualize the annotated bipartite CFG with Graphviz.
+void EdgeBundles::view() const {
+  ViewGraph(*this, "EdgeBundles");
+}