Clean up the runtime read barrier and fix fake address dependency.

- Rename GetReadBarrierPointer to GetReadBarrierState.
- Change its return type to uint32_t.
- Fix the runtime fake address dependency for arm/arm64 using inline
  asm.
- Drop ReadBarrier::black_ptr_ and some brooks code.

Bug: 12687968
Test: test-art with CC, Ritz EAAC, libartd boot on N9.
Change-Id: I595970db825db5be2e98ee1fcbd7696d5501af55
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index 4823caa..74ba33e 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -378,8 +378,8 @@
   CHECK(java_lang_Class.Get() != nullptr);
   mirror::Class::SetClassClass(java_lang_Class.Get());
   java_lang_Class->SetClass(java_lang_Class.Get());
-  if (kUseBakerOrBrooksReadBarrier) {
-    java_lang_Class->AssertReadBarrierPointer();
+  if (kUseBakerReadBarrier) {
+    java_lang_Class->AssertReadBarrierState();
   }
   java_lang_Class->SetClassSize(class_class_size);
   java_lang_Class->SetPrimitiveType(Primitive::kPrimNot);