Add dummy -ast-dump support for ObjC category implementations.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@57087 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/ASTConsumers.cpp b/Driver/ASTConsumers.cpp
index 9c74301..24335cf 100644
--- a/Driver/ASTConsumers.cpp
+++ b/Driver/ASTConsumers.cpp
@@ -489,6 +489,8 @@
         }
       } else if (isa<ObjCImplementationDecl>(D)) {
         Out << "Read objc implementation decl\n";
+      } else if (isa<ObjCCategoryImplDecl>(D)) {
+        Out << "Read objc category implementation decl\n";
       }
       else {
         assert(0 && "Unknown decl type!");