[heap] Make link from optimized code to inlined code explicit.

src/crankshaft/lithium-codegen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/lithium-codegen.h"
 
 #include <sstream>
 
 #if V8_TARGET_ARCH_IA32
 #include "src/crankshaft/ia32/lithium-ia32.h"  // NOLINT
@@ skipping 314 matching lines @@
     data->SetArgumentsStackHeight(i,
                                   Smi::FromInt(env->arguments_stack_height()));
     data->SetPc(i, Smi::FromInt(env->pc_offset()));
   }
   code->set_deoptimization_data(*data);
 }
 
 
 void LCodeGenBase::PopulateDeoptimizationLiteralsWithInlinedFunctions() {
   DCHECK_EQ(0, deoptimization_literals_.length());
-  for (auto function : chunk()->inlined_functions()) {
+  for (Handle<SharedFunctionInfo> function : chunk()->inlined_functions()) {
     DefineDeoptimizationLiteral(function);
   }
   inlined_function_count_ = deoptimization_literals_.length();
+
+  // Define deoptimization literals for all unoptimized code objects of inlined
+  // functions. This ensures unoptimized code is kept alive by optimized code.
+  AllowDeferredHandleDereference allow_shared_function_info_dereference;
+  for (Handle<SharedFunctionInfo> function : chunk()->inlined_functions()) {
+    DefineDeoptimizationLiteral(handle(function->code()));
+  }
 }
 
 
 Deoptimizer::DeoptInfo LCodeGenBase::MakeDeoptInfo(
     LInstruction* instr, Deoptimizer::DeoptReason deopt_reason) {
   Deoptimizer::DeoptInfo deopt_info(instr->hydrogen_value()->position(),
                                     instr->Mnemonic(), deopt_reason);
   HEnterInlined* enter_inlined = instr->environment()->entry();
   deopt_info.inlining_id = enter_inlined ? enter_inlined->inlining_id() : 0;
   return deopt_info;
 }
 }  // namespace internal
 }  // namespace v8