SIL optimizations: Implement the new API for analysis invalidation.

There are now separate functions for function addition and deletion instead of InvalidationKind::Function.
Also, there is a new function for witness/vtable invalidations.

rdar://problem/29311657

include/swift/SILOptimizer/Analysis/ClassHierarchyAnalysis.h

@@ -44,10 +44,24 @@ public:
     return S->getKind() == AnalysisKind::ClassHierarchy;
   }
 
-  virtual void invalidate(SILAnalysis::InvalidationKind K) {
-    // Nothing can invalidate the ClassHierarchyAnalysis!
+  /// Invalidate all information in this analysis.
+  virtual void invalidate() override {
+    // Nothing can invalidate, because types are static and cannot be changed
+    // during the SIL pass pipeline.
   }
 
+  /// Invalidate all of the information for a specific function.
+  virtual void invalidate(SILFunction *F, InvalidationKind K) override { }
+
+  /// Notify the analysis about a newly created function.
+  virtual void notifyAddFunction(SILFunction *F) override { }
+
+  /// Notify the analysis about a function which will be deleted from the
+  /// module.
+  virtual void notifyDeleteFunction(SILFunction *F) override { }
+
+  /// Notify the analysis about changed witness or vtables.
+  virtual void invalidateFunctionTables() override { }
 
   /// Returns a list of the known direct subclasses of a class \p C in
   /// the current module.
@@ -87,10 +101,6 @@ public:
     return ProtocolImplementationsCache.count(C);
   }
 
-  virtual void invalidate(SILFunction *F, SILAnalysis::InvalidationKind K) {
-    invalidate(K);
-  }
-
 private:
   /// Compute inheritance properties.
   void init();