[heap] Incremental marking: Fix compile on MIPS

src/heap/incremental-marking.cc

 // 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.
 
 #include "src/heap/incremental-marking.h"
 
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/conversions.h"
 #include "src/heap/gc-idle-time-handler.h"
@@ skipping 1031 matching lines @@
 }
 
 double IncrementalMarking::AdvanceIncrementalMarking(
     double deadline_in_ms, IncrementalMarking::StepActions step_actions) {
   DCHECK(!IsStopped());
 
   intptr_t step_size_in_bytes = GCIdleTimeHandler::EstimateMarkingStepSize(
       GCIdleTimeHandler::kIncrementalMarkingStepTimeInMs,
       heap()->tracer()->IncrementalMarkingSpeedInBytesPerMillisecond());
   double remaining_time_in_ms = 0.0;
-  intptr_t bytes_processed = 0;
 
   do {
-    bytes_processed =
-        Step(step_size_in_bytes, step_actions.completion_action,
-             step_actions.force_marking, step_actions.force_completion);
+    Step(step_size_in_bytes, step_actions.completion_action,
+         step_actions.force_marking, step_actions.force_completion);
     remaining_time_in_ms =
         deadline_in_ms - heap()->MonotonicallyIncreasingTimeInMs();
   } while (!heap_->mark_compact_collector()->marking_deque()->IsEmpty() &&
            remaining_time_in_ms >=
                2.0 * GCIdleTimeHandler::kIncrementalMarkingStepTimeInMs &&
            !IsComplete() &&
            !heap()->mark_compact_collector()->marking_deque()->IsEmpty());
   return remaining_time_in_ms;
 }
 
@@ skipping 238 matching lines @@
   idle_marking_delay_counter_++;
 }
 
 
 void IncrementalMarking::ClearIdleMarkingDelayCounter() {
   idle_marking_delay_counter_ = 0;
 }
 
 }  // namespace internal
 }  // namespace v8