diff --git a/include/clang/Basic/DiagnosticGroups.td b/include/clang/Basic/DiagnosticGroups.td
index 0b46c8a..c98dfae 100644
--- a/include/clang/Basic/DiagnosticGroups.td
+++ b/include/clang/Basic/DiagnosticGroups.td
@@ -145,6 +145,9 @@
 def : DiagGroup<"old-style-definition">;
 def OutOfLineDeclaration : DiagGroup<"out-of-line-declaration">;
 def : DiagGroup<"overflow">;
+def ForwardClassReceiver : DiagGroup<"receiver-forward-class">;
+def MethodAccess : DiagGroup<"objc-method-access">;
+def ObjCReceiver : DiagGroup<"receiver-expr">;
 def OverlengthStrings : DiagGroup<"overlength-strings">;
 def OverloadedVirtual : DiagGroup<"overloaded-virtual">;
 def ObjCPropertyImpl : DiagGroup<"objc-property-implementation">;
diff --git a/include/clang/Basic/DiagnosticSemaKinds.td b/include/clang/Basic/DiagnosticSemaKinds.td
index d69f536..41b8b8a 100644
--- a/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/include/clang/Basic/DiagnosticSemaKinds.td
@@ -3517,7 +3517,7 @@
   "receiver type %0 for instance message is a forward declaration">;
 def warn_receiver_forward_instance : Warning<
   "receiver type %0 for instance message is a forward declaration">,
-  InGroup<DiagGroup<"receiver-forward-class">>, DefaultIgnore;
+  InGroup<ForwardClassReceiver>, DefaultIgnore;
 def err_arc_collection_forward : Error<
   "collection expression type %0 is a forward declaration">;
 def err_arc_multiple_method_decl : Error< 
@@ -4077,13 +4077,17 @@
 
 // Obj-c expressions
 def warn_root_inst_method_not_found : Warning<
-  "instance method %0 is being used on 'Class' which is not in the root class">;
+  "instance method %0 is being used on 'Class' which is not in the root class">,
+  InGroup<MethodAccess>;
 def warn_class_method_not_found : Warning<
-  "class method %objcclass0 not found (return type defaults to 'id')">;
+  "class method %objcclass0 not found (return type defaults to 'id')">,
+  InGroup<MethodAccess>;
 def warn_instance_method_on_class_found : Warning<
-  "instance method %0 found instead of class method %1">;
+  "instance method %0 found instead of class method %1">,
+  InGroup<MethodAccess>;
 def warn_inst_method_not_found : Warning<
-  "instance method %objcinstance0 not found (return type defaults to 'id')">;
+  "instance method %objcinstance0 not found (return type defaults to 'id')">,
+  InGroup<MethodAccess>;
 def error_no_super_class_message : Error<
   "no @interface declaration found in class messaging of %0">;
 def error_root_class_cannot_use_super : Error<
@@ -4098,7 +4102,7 @@
   "missing '[' at start of message send expression">;
 def warn_bad_receiver_type : Warning<
   "receiver type %0 is not 'id' or interface pointer, consider "
-  "casting it to 'id'">;
+  "casting it to 'id'">,InGroup<ObjCReceiver>;
 def err_bad_receiver_type : Error<"bad receiver type %0">;
 def err_unknown_receiver_suggest : Error<
   "unknown receiver %0; did you mean %1?">;
@@ -5503,7 +5507,8 @@
 // Type
 def ext_invalid_sign_spec : Extension<"'%0' cannot be signed or unsigned">;
 def warn_receiver_forward_class : Warning<
-    "receiver %0 is a forward class and corresponding @interface may not exist">;
+    "receiver %0 is a forward class and corresponding @interface may not exist">,
+    InGroup<ForwardClassReceiver>;
 def note_method_sent_forward_class : Note<"method %0 is used for the forward class">;
 def ext_missing_declspec : ExtWarn<
   "declaration specifier missing, defaulting to 'int'">;
diff --git a/test/Misc/warning-flags.c b/test/Misc/warning-flags.c
index 3e2140f..2799de5 100644
--- a/test/Misc/warning-flags.c
+++ b/test/Misc/warning-flags.c
@@ -17,7 +17,7 @@
 
 The list of warnings below should NEVER grow.  It should gradually shrink to 0.
 
-CHECK: Warnings without flags (238):
+CHECK: Warnings without flags (232):
 CHECK-NEXT:   ext_anonymous_struct_union_qualified
 CHECK-NEXT:   ext_binary_literal
 CHECK-NEXT:   ext_cast_fn_obj
@@ -105,7 +105,6 @@
 CHECK-NEXT:   warn_attribute_weak_on_field
 CHECK-NEXT:   warn_attribute_weak_on_local
 CHECK-NEXT:   warn_attribute_wrong_decl_type
-CHECK-NEXT:   warn_bad_receiver_type
 CHECK-NEXT:   warn_bitfield_width_exceeds_type_size
 CHECK-NEXT:   warn_bool_switch_condition
 CHECK-NEXT:   warn_braces_around_scalar_init
@@ -114,7 +113,6 @@
 CHECK-NEXT:   warn_call_wrong_number_of_arguments
 CHECK-NEXT:   warn_case_empty_range
 CHECK-NEXT:   warn_char_constant_too_large
-CHECK-NEXT:   warn_class_method_not_found
 CHECK-NEXT:   warn_cmdline_missing_macro_defs
 CHECK-NEXT:   warn_collection_expr_type
 CHECK-NEXT:   warn_conflicting_param_types
@@ -159,8 +157,6 @@
 CHECK-NEXT:   warn_incompatible_qualified_id
 CHECK-NEXT:   warn_initializer_string_for_char_array_too_long
 CHECK-NEXT:   warn_inline_namespace_reopened_noninline
-CHECK-NEXT:   warn_inst_method_not_found
-CHECK-NEXT:   warn_instance_method_on_class_found
 CHECK-NEXT:   warn_integer_too_large
 CHECK-NEXT:   warn_integer_too_large_for_signed
 CHECK-NEXT:   warn_invalid_asm_cast_lvalue
@@ -224,13 +220,11 @@
 CHECK-NEXT:   warn_property_getter_owning_mismatch
 CHECK-NEXT:   warn_property_types_are_incompatible
 CHECK-NEXT:   warn_readonly_property
-CHECK-NEXT:   warn_receiver_forward_class
 CHECK-NEXT:   warn_redecl_library_builtin
 CHECK-NEXT:   warn_redeclaration_without_attribute_prev_attribute_ignored
 CHECK-NEXT:   warn_register_objc_catch_parm
 CHECK-NEXT:   warn_related_result_type_compatibility_class
 CHECK-NEXT:   warn_related_result_type_compatibility_protocol
-CHECK-NEXT:   warn_root_inst_method_not_found
 CHECK-NEXT:   warn_second_parameter_of_va_start_not_last_named_argument
 CHECK-NEXT:   warn_second_parameter_to_va_arg_never_compatible
 CHECK-NEXT:   warn_standalone_specifier