Add Destroy method to Types, making there destruction more harmonious with
the destruction of Decls and Stmts.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@51385 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index 3165ad0..923aab2 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -29,13 +29,7 @@
 ASTContext::~ASTContext() {
   // Deallocate all the types.
   while (!Types.empty()) {
-    if (FunctionTypeProto *FT = dyn_cast<FunctionTypeProto>(Types.back())) {
-      // Destroy the object, but don't call delete.  These are malloc'd.
-      FT->~FunctionTypeProto();
-      free(FT);
-    } else {
-      delete Types.back();
-    }
+    Types.back()->Destroy(*this);
     Types.pop_back();
   }
 }