Add getPotentialPassManagerType(). No functionality change, yet.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36149 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/LoopPass.h

@@ -57,6 +57,10 @@ class LoopPass : public Pass {
   virtual void assignPassManager(PMStack &PMS,
                                  PassManagerType PMT = PMT_LoopPassManager);
 
+  ///  Return what kind of Pass Manager can manage this pass.
+  virtual PassManagerType getPotentialPassManagerType() const {
+    return PMT_LoopPassManager;
+  }
 };
 
 class LPPassManager : public FunctionPass, public PMDataManager {

include/llvm/CallGraphSCCPass.h

@@ -54,6 +54,11 @@ struct CallGraphSCCPass : public Pass {
   virtual void assignPassManager(PMStack &PMS,
                                  PassManagerType PMT = PMT_CallGraphPassManager);
 
+  ///  Return what kind of Pass Manager can manage this pass.
+  virtual PassManagerType getPotentialPassManagerType() const {
+    return PMT_CallGraphPassManager;
+  }
+
   /// getAnalysisUsage - For this class, we declare that we require and preserve
   /// the call graph.  If the derived class implements this method, it should
   /// always explicitly call the implementation here.

include/llvm/Pass.h

@@ -127,6 +127,11 @@ public:
   /// Check if available pass managers are suitable for this pass or not.
   virtual void preparePassManager(PMStack &PMS) {}
   
+  ///  Return what kind of Pass Manager can manage this pass.
+  virtual PassManagerType getPotentialPassManagerType() const {
+    return PMT_Unknown; 
+  }
+
   // Access AnalysisResolver
   inline void setResolver(AnalysisResolver *AR) { Resolver = AR; }
   inline AnalysisResolver *getResolver() { return Resolver; }
@@ -216,6 +221,12 @@ public:
 
   virtual void assignPassManager(PMStack &PMS, 
                                  PassManagerType T = PMT_ModulePassManager);
+
+  ///  Return what kind of Pass Manager can manage this pass.
+  virtual PassManagerType getPotentialPassManagerType() const {
+    return PMT_ModulePassManager;
+  }
+
   // Force out-of-line virtual method.
   virtual ~ModulePass();
 };
@@ -283,6 +294,11 @@ public:
 
   virtual void assignPassManager(PMStack &PMS, 
                                  PassManagerType T = PMT_FunctionPassManager);
+
+  ///  Return what kind of Pass Manager can manage this pass.
+  virtual PassManagerType getPotentialPassManagerType() const {
+    return PMT_FunctionPassManager;
+  }
 };
 
 
@@ -338,6 +354,11 @@ public:
 
   virtual void assignPassManager(PMStack &PMS, 
                                  PassManagerType T = PMT_BasicBlockPassManager);
+
+  ///  Return what kind of Pass Manager can manage this pass.
+  virtual PassManagerType getPotentialPassManagerType() const {
+    return PMT_BasicBlockPassManager; 
+  }
 };
 
 /// PMStack