Change a few places to use string version of GetTypeId

GetTypeId is about 20% faster than GetStringId + integer GetTypeID
since it does less binary searches.

Change-Id: I876c4ac89ab206acca217b2287b0197ef2e408c2
diff --git a/runtime/mirror/object_test.cc b/runtime/mirror/object_test.cc
index f5a0445..c1284a6 100644
--- a/runtime/mirror/object_test.cc
+++ b/runtime/mirror/object_test.cc
@@ -307,10 +307,7 @@
   ScopedObjectAccess soa(Thread::Current());
   Class* java_util_Arrays = class_linker_->FindSystemClass(soa.Self(), "Ljava/util/Arrays;");
   ArtMethod* sort = java_util_Arrays->FindDirectMethod("sort", "([I)V", sizeof(void*));
-  const DexFile::StringId* string_id = java_lang_dex_file_->FindStringId("[I");
-  ASSERT_TRUE(string_id != nullptr);
-  const DexFile::TypeId* type_id = java_lang_dex_file_->FindTypeId(
-      java_lang_dex_file_->GetIndexForStringId(*string_id));
+  const DexFile::TypeId* type_id = java_lang_dex_file_->FindTypeId("[I");
   ASSERT_TRUE(type_id != nullptr);
   uint32_t type_idx = java_lang_dex_file_->GetIndexForTypeId(*type_id);
   Object* array = CheckAndAllocArrayFromCodeInstrumented(
@@ -367,16 +364,10 @@
   Handle<mirror::ClassLoader> loader(hs.NewHandle(soa.Decode<ClassLoader*>(class_loader)));
   Class* klass = class_linker_->FindClass(soa.Self(), "LStaticsFromCode;", loader);
   ArtMethod* clinit = klass->FindClassInitializer(sizeof(void*));
-  const DexFile::StringId* klass_string_id = dex_file->FindStringId("LStaticsFromCode;");
-  ASSERT_TRUE(klass_string_id != nullptr);
-  const DexFile::TypeId* klass_type_id = dex_file->FindTypeId(
-      dex_file->GetIndexForStringId(*klass_string_id));
+  const DexFile::TypeId* klass_type_id = dex_file->FindTypeId("LStaticsFromCode;");
   ASSERT_TRUE(klass_type_id != nullptr);
 
-  const DexFile::StringId* type_string_id = dex_file->FindStringId("Ljava/lang/Object;");
-  ASSERT_TRUE(type_string_id != nullptr);
-  const DexFile::TypeId* type_type_id = dex_file->FindTypeId(
-      dex_file->GetIndexForStringId(*type_string_id));
+  const DexFile::TypeId* type_type_id = dex_file->FindTypeId("Ljava/lang/Object;");
   ASSERT_TRUE(type_type_id != nullptr);
 
   const DexFile::StringId* name_str_id = dex_file->FindStringId("s0");