Revert "Temporarily add debug logging for b/31357497"

This reverts commit a10ae7865a140d45fc01e934a44ba5c8781b4a52.

Reason for revert: No longer required

Bug: 31357497
Bug: 12687968
Change-Id: I9e8a6d5f61196d97379bdc2e914b55d74e37a187
Test: presubmit
diff --git a/runtime/interpreter/interpreter_common.h b/runtime/interpreter/interpreter_common.h
index 39a1db8..0818e06 100644
--- a/runtime/interpreter/interpreter_common.h
+++ b/runtime/interpreter/interpreter_common.h
@@ -266,13 +266,6 @@
     return false;
   }
   const uint32_t vtable_idx = (is_range) ? inst->VRegB_3rc() : inst->VRegB_35c();
-  // Debug code for b/31357497. To be removed.
-  if (kUseReadBarrier) {
-    CHECK(receiver->GetClass() != nullptr)
-        << "Null class found in object " << receiver << " in region type "
-        << Runtime::Current()->GetHeap()->ConcurrentCopyingCollector()->
-            RegionSpace()->GetRegionType(receiver.Ptr());
-  }
   CHECK(receiver->GetClass()->ShouldHaveEmbeddedVTable());
   ArtMethod* const called_method = receiver->GetClass()->GetEmbeddedVTableEntry(
       vtable_idx, Runtime::Current()->GetClassLinker()->GetImagePointerSize());