Faster `ClassTable::UpdateClass()`.

In the `ClassTable::UpdateClass()`, both the old and the new
`Class` objects reference the same dex file and type index.
Therefore it's better to do the lookup with the new `Class`
object as the `Class:DescriptorEquals(ObjPtr<Class>)` can
avoid the string comparison for the descriptor match in this
case and we compare descriptors only for hash conflicts.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 338123769
Change-Id: I23960c9c3b34b7f7fdd2fce6b191fd9c4efe7320

1 files changed, 1 insertions, 1 deletions

diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index 08cc153d84..501470c4b5 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -6403,7 +6403,7 @@ bool ClassLinker::LinkClass(Thread* self,
       const ObjPtr<mirror::ClassLoader> class_loader = h_new_class.Get()->GetClassLoader();
       ClassTable* const table = InsertClassTableForClassLoader(class_loader);
       const ObjPtr<mirror::Class> existing =
-          table->UpdateClass(descriptor, h_new_class.Get(), ComputeModifiedUtf8Hash(descriptor));
+          table->UpdateClass(h_new_class.Get(), ComputeModifiedUtf8Hash(descriptor));
       CHECK_EQ(existing, klass.Get());
       WriteBarrierOnClassLoaderLocked(class_loader, h_new_class.Get());
     }