Fix PathTracer.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 31ebbb18c8a42bf0399208099e20ac7f910c2d8c..f17540af484ce2e3b95e31f43ead0dbb4862fa60 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -3673,8 +3673,8 @@ void* FixedTypedArrayBase::DataPtr() {
 }
 
 
-int FixedTypedArrayBase::DataSize() {
-  InstanceType instance_type = map()->instance_type();
+int FixedTypedArrayBase::DataSizeFromMap(Map* map) {
+  InstanceType instance_type = map->instance_type();
   int element_size;
   switch (instance_type) {
 #define TYPED_ARRAY_CASE(Type, type, TYPE, ctype, size)                       \
@@ -3693,7 +3693,12 @@ int FixedTypedArrayBase::DataSize() {
 
 
 int FixedTypedArrayBase::size() {
-  return OBJECT_POINTER_ALIGN(kDataOffset + DataSize());
+  return OBJECT_POINTER_ALIGN(kDataOffset + DataSizeFromMap(map()));
+}
+
+
+int FixedTypedArrayBase::SizeFromMap(Map* map) {
+  return OBJECT_POINTER_ALIGN(kDataOffset + DataSizeFromMap(map));
 }
 
 
@@ -3951,7 +3956,7 @@ int HeapObject::SizeFromMap(Map* map) {
   }
   if (instance_type >= FIRST_FIXED_TYPED_ARRAY_TYPE &&
       instance_type <= LAST_FIXED_TYPED_ARRAY_TYPE) {
-    return reinterpret_cast<FixedTypedArrayBase*>(this)->size();
+    return reinterpret_cast<FixedTypedArrayBase*>(this)->SizeFromMap(map);
   }
   ASSERT(instance_type == CODE_TYPE);
   return reinterpret_cast<Code*>(this)->CodeSize();