Eliminate RETURN_IF_EMPTY_HANDLE macro

src/debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2088 matching lines @@
       }
 
       // Make sure that the shared full code is compiled with debug
       // break slots.
       if (!shared->code()->has_debug_break_slots()) {
         // Try to compile the full code with debug break slots. If it
         // fails just keep the current code.
         bool prev_force_debugger_active =
             isolate_->debugger()->force_debugger_active();
         isolate_->debugger()->set_force_debugger_active(true);
-        Handle<Code> code = Compiler::GetCodeForDebugging(function);
+        Handle<Code> code = Compiler::GetCodeForDebugging(
+            function).ToHandleChecked();
         function->ReplaceCode(*code);
         isolate_->debugger()->set_force_debugger_active(
             prev_force_debugger_active);
       }
 
       // Keep function code in sync with shared function info.
       function->set_code(shared->code());
     }
 
     RedirectActivationsToRecompiledCodeOnThread(isolate_,
@@ skipping 95 matching lines @@
     has_break_points_ = true;
 
     // If the candidate found is compiled we are done.
     done = target->is_compiled();
     if (!done) {
       // If the candidate is not compiled, compile it to reveal any inner
       // functions which might contain the requested source position. This
       // will compile all inner functions that cannot be compiled without a
       // context, because Compiler::BuildFunctionInfo checks whether the
       // debugger is active.
-      Handle<Code> result = target_function.is_null()
+      MaybeHandle<Code> maybe_result = target_function.is_null()
           ? Compiler::GetUnoptimizedCode(target)
           : Compiler::GetUnoptimizedCode(target_function);
-      if (result.is_null()) return isolate_->heap()->undefined_value();
+      if (maybe_result.is_null()) return isolate_->heap()->undefined_value());
     }
   }  // End while loop.
 
   return *target;
 }
 
 
 // Ensures the debug information is present for shared.
 bool Debug::EnsureDebugInfo(Handle<SharedFunctionInfo> shared,
                             Handle<JSFunction> function) {
@@ skipping 1496 matching lines @@
     {
       Locker locker(reinterpret_cast<v8::Isolate*>(isolate_));
       isolate_->debugger()->CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal