Refactor java.lang.reflect implementation

Cherry-picked from commit ed41d5c44299ec5d44b8514f6e17f802f48094d1.

Move to ArtMethod/Field instead of AbstractMethod/Field and have
java.lang.reflect APIs delegate to ArtMethod/ArtField.

Bug: 10014286.

Change-Id: Iafc1d8c5b62562c9af8fb9fd8c5e1d61270536e7
diff --git a/runtime/exception_test.cc b/runtime/exception_test.cc
index 933b74a..e48208d 100644
--- a/runtime/exception_test.cc
+++ b/runtime/exception_test.cc
@@ -95,8 +95,8 @@
   UnsignedLeb128EncodingVector fake_vmap_table_data_;
   std::vector<uint8_t> fake_gc_map_;
 
-  mirror::AbstractMethod* method_f_;
-  mirror::AbstractMethod* method_g_;
+  mirror::ArtMethod* method_f_;
+  mirror::ArtMethod* method_g_;
 
  private:
   mirror::Class* my_klass_;