Adding additional logging to Class Verbose Log

The additional logging is so that every class that is verified is logged
(even if there are no failures). Additionally, logging was added to see
which classes are being re-verified.

Bug: 37754950
Test: m -j test-art-host
Change-Id: I946a5a35558666a81a11a1a2825a4731f47857ef
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index 141df1e..928645a 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -4107,6 +4107,10 @@
     }
   }
 
+  VLOG(class_linker) << "Beginning verification for class: "
+                     << klass->PrettyDescriptor()
+                     << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8();
+
   // Verify super class.
   StackHandleScope<2> hs(self);
   MutableHandle<mirror::Class> supertype(hs.NewHandle(klass->GetSuperClass()));
@@ -4161,6 +4165,13 @@
   const DexFile& dex_file = *klass->GetDexCache()->GetDexFile();
   mirror::Class::Status oat_file_class_status(mirror::Class::kStatusNotReady);
   bool preverified = VerifyClassUsingOatFile(dex_file, klass.Get(), oat_file_class_status);
+
+  VLOG(class_linker) << "Class preverified status for class "
+                     << klass->PrettyDescriptor()
+                     << " in " << klass->GetDexCache()->GetLocation()->ToModifiedUtf8()
+                     << ": "
+                     << preverified;
+
   // If the oat file says the class had an error, re-run the verifier. That way we will get a
   // precise error message. To ensure a rerun, test:
   //     mirror::Class::IsErroneous(oat_file_class_status) => !preverified