Fix A64 after 19635.

TBR=yangguo@chromium.org

Review URL: https://codereview.chromium.org/184103013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19637 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/a64/lithium-codegen-a64.cc

@@ -920,6 +920,8 @@ void LCodeGen::PopulateDeoptimizationData(Handle<Code> code) {
   data->SetInlinedFunctionCount(Smi::FromInt(inlined_function_count_));
   data->SetOptimizationId(Smi::FromInt(info_->optimization_id()));
   if (info_->IsOptimizing()) {
+    // Reference to shared function info does not change between phases.
+    AllowDeferredHandleDereference allow_handle_dereference;
     data->SetSharedFunctionInfo(*info_->shared_info());
   } else {
     data->SetSharedFunctionInfo(Smi::FromInt(0));