Address some review comments

Addressed comments in dex cache and class table. Added class table
test.

Test: mm test-art-host-gtest-class_table_test -j20

Change-Id: I3ec0282247187acb1ec7af25b309501f001a1c3e
diff --git a/runtime/mirror/dex_cache-inl.h b/runtime/mirror/dex_cache-inl.h
index b54e416..a59bb7b 100644
--- a/runtime/mirror/dex_cache-inl.h
+++ b/runtime/mirror/dex_cache-inl.h
@@ -72,7 +72,7 @@
 
 inline Class* DexCache::GetResolvedType(dex::TypeIndex type_idx) {
   // It is theorized that a load acquire is not required since obtaining the resolved class will
-  // always have an address depedency or a lock.
+  // always have an address dependency or a lock.
   DCHECK_LT(type_idx.index_, NumResolvedTypes());
   return GetResolvedTypes()[type_idx.index_].Read();
 }