Check for initialized code stub descriptor in the deoptimizer.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/448683002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22932 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/deoptimizer.cc

@@ -1624,6 +1624,9 @@ void Deoptimizer::DoComputeCompiledStubFrame(TranslationIterator* iterator,
   int major_key = CodeStub::GetMajorKey(compiled_code_);
   CodeStubInterfaceDescriptor* descriptor =
       isolate_->code_stub_interface_descriptor(major_key);
+  // Check that there is a matching descriptor to the major key.
+  // This will fail if there has not been one installed to the isolate.
+  DCHECK_EQ(descriptor->MajorKey(), major_key);
 
   // The output frame must have room for all pushed register parameters
   // and the standard stack frame slots.  Include space for an argument