Move GetClassFromTypeIdx to ArtMethod.

Move GetClassFromTypeIdx out of MethodHelper into ArtMethod in
preparation for the removal of MethodHelper.

Change-Id: I9c03dd8c821944c606ea08cdf92afc80c4275247
diff --git a/runtime/mirror/art_method-inl.h b/runtime/mirror/art_method-inl.h
index 85ef4e6..c29276a 100644
--- a/runtime/mirror/art_method-inl.h
+++ b/runtime/mirror/art_method-inl.h
@@ -140,6 +140,15 @@
   return GetDexCacheResolvedTypes() == other->GetDexCacheResolvedTypes();
 }
 
+inline mirror::Class* ArtMethod::GetClassFromTypeIndex(uint16_t type_idx, bool resolve) {
+  mirror::Class* type = GetDexCacheResolvedType(type_idx);
+  if (type == nullptr && resolve) {
+    type = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, this);
+    CHECK(type != nullptr || Thread::Current()->IsExceptionPending());
+  }
+  return type;
+}
+
 inline uint32_t ArtMethod::GetCodeSize() {
   DCHECK(!IsRuntimeMethod() && !IsProxyMethod()) << PrettyMethod(this);
   const void* code = EntryPointToCodePointer(GetEntryPointFromQuickCompiledCode());