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/gc/space/space_test.h b/runtime/gc/space/space_test.h
index 7778871..cbb3d73 100644
--- a/runtime/gc/space/space_test.h
+++ b/runtime/gc/space/space_test.h
@@ -108,13 +108,10 @@
     EXPECT_GE(size, SizeOfZeroLengthByteArray());
     EXPECT_TRUE(byte_array_class != nullptr);
     o->SetClass(byte_array_class);
-    if (kUseBakerOrBrooksReadBarrier) {
+    if (kUseBakerReadBarrier) {
       // Like the proper heap object allocation, install and verify
-      // the correct read barrier pointer.
-      if (kUseBrooksReadBarrier) {
-        o->SetReadBarrierPointer(o);
-      }
-      o->AssertReadBarrierPointer();
+      // the correct read barrier state.
+      o->AssertReadBarrierState();
     }
     mirror::Array* arr = o->AsArray<kVerifyNone>();
     size_t header_size = SizeOfZeroLengthByteArray();