ART: Add dex::TypeIndex

Add abstraction for uint16_t type index.

Test: m test-art-host
Change-Id: I47708741c7c579cbbe59ab723c1e31c5fe71f83a
diff --git a/runtime/class_linker-inl.h b/runtime/class_linker-inl.h
index 7359243..81adaeb 100644
--- a/runtime/class_linker-inl.h
+++ b/runtime/class_linker-inl.h
@@ -86,7 +86,7 @@
   return string.Ptr();
 }
 
-inline mirror::Class* ClassLinker::ResolveType(uint16_t type_idx, ArtMethod* referrer) {
+inline mirror::Class* ClassLinker::ResolveType(dex::TypeIndex type_idx, ArtMethod* referrer) {
   Thread::PoisonObjectPointersIfDebug();
   ObjPtr<mirror::Class> resolved_type =
       referrer->GetDexCacheResolvedType(type_idx, image_pointer_size_);
@@ -103,7 +103,7 @@
   return resolved_type.Ptr();
 }
 
-inline mirror::Class* ClassLinker::ResolveType(uint16_t type_idx, ArtField* referrer) {
+inline mirror::Class* ClassLinker::ResolveType(dex::TypeIndex type_idx, ArtField* referrer) {
   Thread::PoisonObjectPointersIfDebug();
   ObjPtr<mirror::Class> declaring_class = referrer->GetDeclaringClass();
   ObjPtr<mirror::DexCache> dex_cache_ptr = declaring_class->GetDexCache();