Revert "[PM] Add pass run listeners to the pass manager."

Revert the current implementation and C API. New implementation and C APIs are
in the works.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208904 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/PassSupport.h

@@ -31,7 +31,6 @@
 namespace llvm {
 
 class TargetMachine;
-class LLVMContext;
 //===---------------------------------------------------------------------------
 /// PassInfo class - An instance of this class exists for every pass known by
 /// the system, and can be obtained from a live Pass by calling its
@@ -356,21 +355,6 @@ struct PassRegistrationListener {
   virtual void passEnumerate(const PassInfo *) {}
 };
 
-//===---------------------------------------------------------------------------
-/// PassRunListener class - This class is meant to be derived from by
-/// clients that are interested in which and when passes are run at runtime.
-struct PassRunListener {
-  /// PassRunListener ctor - Add the current object to the list of
-  /// PassRunListeners...
-  PassRunListener(LLVMContext *);
-
-  virtual ~PassRunListener();
-
-  /// Callback function - This functions is invoked whenever a pass has run.
-  virtual void passRun(LLVMContext *, Pass *, Module *, Function *,
-                       BasicBlock *) {}
-};
-
 
 } // End llvm namespace