Add more debugging info around ResolveField.

To better diagnose the DCHECK that we have hit here:
https://android-build.googleplex.com/builds/git_master-art-host-linux-art-jit/6325844/logs/build.log

Test: test.py
Change-Id: If160b74055c27cd02bde27e29c7e7f731c458f4d
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index c3e630f..d46f93d 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -8875,6 +8875,7 @@
                                     Handle<mirror::ClassLoader> class_loader,
                                     bool is_static) {
   DCHECK(dex_cache != nullptr);
+  DCHECK(!Thread::Current()->IsExceptionPending()) << Thread::Current()->GetException()->Dump();
   ArtField* resolved = dex_cache->GetResolvedField(field_idx, image_pointer_size_);
   Thread::PoisonObjectPointersIfDebug();
   if (resolved != nullptr) {