[LoopAccesses] Add missing const to APIs in VectorizationReport

When I split out LoopAccessReport from this, I need to create some temps
so constness becomes necessary.

This is part of the patchset that converts LoopAccessAnalysis into an
actual analysis pass.

llvm-svn: 229896

llvm/include/llvm/Analysis/LoopAccessAnalysis.h

@@ -38,10 +38,10 @@ class SCEV;
 /// the user why vectorization did not occur.
 class VectorizationReport {
   std::string Message;
-  Instruction *Instr;
+  const Instruction *Instr;
 
 public:
-  VectorizationReport(Instruction *I = nullptr)
+  VectorizationReport(const Instruction *I = nullptr)
       : Message("loop not vectorized: "), Instr(I) {}
 
   template <typename A> VectorizationReport &operator<<(const A &Value) {
@@ -50,15 +50,16 @@ public:
     return *this;
   }
 
-  Instruction *getInstr() { return Instr; }
+  const Instruction *getInstr() const { return Instr; }
 
   std::string &str() { return Message; }
+  const std::string &str() const { return Message; }
   operator Twine() { return Message; }
 
   /// \brief Emit an analysis note for \p PassName with the debug location from
   /// the instruction in \p Message if available.  Otherwise use the location of
   /// \p TheLoop.
-  static void emitAnalysis(VectorizationReport &Message,
+  static void emitAnalysis(const VectorizationReport &Message,
                            const Function *TheFunction,
                            const Loop *TheLoop,
                            const char *PassName);

llvm/lib/Analysis/LoopAccessAnalysis.cpp

@@ -50,12 +50,12 @@ bool VectorizerParams::isInterleaveForced() {
   return ::VectorizationInterleave.getNumOccurrences() > 0;
 }
 
-void VectorizationReport::emitAnalysis(VectorizationReport &Message,
+void VectorizationReport::emitAnalysis(const VectorizationReport &Message,
                                        const Function *TheFunction,
                                        const Loop *TheLoop,
                                        const char *PassName) {
   DebugLoc DL = TheLoop->getStartLoc();
-  if (Instruction *I = Message.getInstr())
+  if (const Instruction *I = Message.getInstr())
     DL = I->getDebugLoc();
   emitOptimizationRemarkAnalysis(TheFunction->getContext(), PassName,
                                  *TheFunction, DL, Message.str());

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -815,7 +815,7 @@ private:
 
   /// Report an analysis message to assist the user in diagnosing loops that are
   /// not vectorized.
-  void emitAnalysis(VectorizationReport &Message) {
+  void emitAnalysis(const VectorizationReport &Message) {
     VectorizationReport::emitAnalysis(Message, TheFunction, TheLoop, LV_NAME);
   }
 
@@ -952,7 +952,7 @@ private:
 
   /// Report an analysis message to assist the user in diagnosing loops that are
   /// not vectorized.
-  void emitAnalysis(VectorizationReport &Message) {
+  void emitAnalysis(const VectorizationReport &Message) {
     VectorizationReport::emitAnalysis(Message, TheFunction, TheLoop, LV_NAME);
   }