Switch GetConcurrentlyOptimizedCode to MaybeHandle.

src/compiler.h

 // Copyright 2012 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.
 
 #ifndef V8_COMPILER_H_
 #define V8_COMPILER_H_
 
 #include "src/allocation.h"
 #include "src/ast/ast.h"
 #include "src/bailout-reason.h"
@@ skipping 619 matching lines @@
   // Generate and return optimized code or start a concurrent optimization job.
   // In the latter case, return the InOptimizationQueue builtin.  On failure,
   // return the empty handle.
   MUST_USE_RESULT static MaybeHandle<Code> GetOptimizedCode(
       Handle<JSFunction> function, ConcurrencyMode mode,
       BailoutId osr_ast_id = BailoutId::None(),
       JavaScriptFrame* osr_frame = nullptr);
 
   // Generate and return code from previously queued optimization job.
   // On failure, return the empty handle.
-  static Handle<Code> GetConcurrentlyOptimizedCode(OptimizedCompileJob* job);
+  MUST_USE_RESULT static MaybeHandle<Code> GetConcurrentlyOptimizedCode(
+      OptimizedCompileJob* job);
 };
 
 
 class CompilationPhase BASE_EMBEDDED {
  public:
   CompilationPhase(const char* name, CompilationInfo* info);
   ~CompilationPhase();
 
  protected:
   bool ShouldProduceTraceOutput() const;
@@ skipping 10 matching lines @@
   size_t info_zone_start_allocation_size_;
   base::ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_H_