Fix more -Wsign-compare warnings in heap, mips, base, etc.

src/heap/gc-tracer.cc

 // Copyright 2014 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/gc-tracer.h"
 
 #include "src/counters.h"
 #include "src/heap/heap-inl.h"
 #include "src/isolate.h"
 
@@ skipping 251 matching lines @@
       current_.incremental_marking_scopes[i] = incremental_marking_scopes_[i];
       current_.scopes[i] = incremental_marking_scopes_[i].duration;
     }
     RecordIncrementalMarkingSpeed(current_.incremental_marking_bytes,
                                   current_.incremental_marking_duration);
     recorded_incremental_mark_compacts_.Push(
         MakeBytesAndDuration(current_.start_object_size, duration));
     ResetIncrementalMarkingCounters();
     combined_mark_compact_speed_cache_ = 0.0;
   } else {
-    DCHECK_EQ(0, current_.incremental_marking_bytes);
+    DCHECK_EQ(0u, current_.incremental_marking_bytes);
     DCHECK_EQ(0, current_.incremental_marking_duration);
     recorded_mark_compacts_.Push(
         MakeBytesAndDuration(current_.start_object_size, duration));
     ResetIncrementalMarkingCounters();
     combined_mark_compact_speed_cache_ = 0.0;
   }
 
   heap_->UpdateTotalGCTime(duration);
 
   if (current_.type == Event::SCAVENGER && FLAG_trace_gc_ignore_scavenger)
@@ skipping 529 matching lines @@
 }
 
 void GCTracer::ResetSurvivalEvents() { recorded_survival_ratios_.Reset(); }
 
 void GCTracer::NotifyIncrementalMarkingStart() {
   incremental_marking_start_time_ = heap_->MonotonicallyIncreasingTimeInMs();
 }
 
 }  // namespace internal
 }  // namespace v8