[heap] Use size_t throughout MemoryAllocator

src/heap/gc-tracer.h

 // 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.
 
 #ifndef V8_HEAP_GC_TRACER_H_
 #define V8_HEAP_GC_TRACER_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/base/platform/platform.h"
 #include "src/counters.h"
@@ skipping 203 matching lines @@
     // Memory reduction flag set.
     bool reduce_memory;
 
     // Size of objects in heap set in constructor.
     intptr_t start_object_size;
 
     // Size of objects in heap set in destructor.
     intptr_t end_object_size;
 
     // Size of memory allocated from OS set in constructor.
-    intptr_t start_memory_size;
+    size_t start_memory_size;
 
     // Size of memory allocated from OS set in destructor.
-    intptr_t end_memory_size;
+    size_t end_memory_size;
 
     // Total amount of space either wasted or contained in one of free lists
     // before the current GC.
     intptr_t start_holes_size;
 
     // Total amount of space either wasted or contained in one of free lists
     // after the current GC.
     intptr_t end_holes_size;
 
     // Size of new space objects in constructor.
@@ skipping 227 matching lines @@
   RingBuffer<BytesAndDuration> recorded_old_generation_allocations_;
   RingBuffer<double> recorded_context_disposal_times_;
   RingBuffer<double> recorded_survival_ratios_;
 
   DISALLOW_COPY_AND_ASSIGN(GCTracer);
 };
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_GC_TRACER_H_