Do not use possibly stale values for cache size, etc.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index abfd4436dfa1720a540d7777d555b5c5f58ccefb..de0ffa3731b02c06273201cce9c83f52a0c08140 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1978,13 +1978,13 @@ void ExternalTwoByteString::set_resource(
 
 
 void JSFunctionResultCache::MakeZeroSize() {
-  set(kFingerIndex, Smi::FromInt(kEntriesIndex));
-  set(kCacheSizeIndex, Smi::FromInt(kEntriesIndex));
+  set_finger_index(kEntriesIndex);
+  set_size(kEntriesIndex);
 }
 
 
 void JSFunctionResultCache::Clear() {
-  int cache_size = Smi::cast(get(kCacheSizeIndex))->value();
+  int cache_size = size();
   Object** entries_start = RawField(this, OffsetOfElementAt(kEntriesIndex));
   MemsetPointer(entries_start,
                 Heap::the_hole_value(),
@@ -1993,6 +1993,26 @@ void JSFunctionResultCache::Clear() {
 }
 
 
+int JSFunctionResultCache::size() {
+  return Smi::cast(get(kCacheSizeIndex))->value();
+}
+
+
+void JSFunctionResultCache::set_size(int size) {
+  set(kCacheSizeIndex, Smi::FromInt(size));
+}
+
+
+int JSFunctionResultCache::finger_index() {
+  return Smi::cast(get(kFingerIndex))->value();
+}
+
+
+void JSFunctionResultCache::set_finger_index(int finger_index) {
+  set(kFingerIndex, Smi::FromInt(finger_index));
+}
+
+
 byte ByteArray::get(int index) {
   ASSERT(index >= 0 && index < this->length());
   return READ_BYTE_FIELD(this, kHeaderSize + index * kCharSize);