Optimize isFinite and isNaN.

src/profile-generator.cc

Index: src/profile-generator.cc
diff --git a/src/profile-generator.cc b/src/profile-generator.cc
index 74dfbf445c219d9cc947aac77140b31cc49cc0c0..db9f8928de7f6c508f7cdb690f0b8df04d62effa 100644
--- a/src/profile-generator.cc
+++ b/src/profile-generator.cc
@@ -1195,9 +1195,12 @@ void HeapSnapshot::AllocateEntries(int entries_count,
                                    int children_count,
                                    int retainers_count) {
   ASSERT(raw_entries_ == NULL);
+  raw_entries_ = NewArray<char>(
+      HeapEntry::EntriesSize(entries_count, children_count, retainers_count));
+#ifdef DEBUG
   raw_entries_size_ =
       HeapEntry::EntriesSize(entries_count, children_count, retainers_count);
-  raw_entries_ = NewArray<char>(raw_entries_size_);
+#endif
 }
 
 
@@ -2981,19 +2984,10 @@ class OutputStreamWriter {
   bool aborted_;
 };
 
-const int HeapSnapshotJSONSerializer::kMaxSerializableSnapshotRawSize =
-    256 * MB;
-
 void HeapSnapshotJSONSerializer::Serialize(v8::OutputStream* stream) {
   ASSERT(writer_ == NULL);
   writer_ = new OutputStreamWriter(stream);
 
-  HeapSnapshot* original_snapshot = NULL;
-  if (snapshot_->raw_entries_size() >= kMaxSerializableSnapshotRawSize) {
-    // The snapshot is too big. Serialize a fake snapshot.
-    original_snapshot = snapshot_;
-    snapshot_ = CreateFakeSnapshot();
-  }
   // Since nodes graph is cyclic, we need the first pass to enumerate
   // them. Strings can be serialized in one pass.
   EnumerateNodes();
@@ -3001,26 +2995,6 @@ void HeapSnapshotJSONSerializer::Serialize(v8::OutputStream* stream) {
 
   delete writer_;
   writer_ = NULL;
-
-  if (original_snapshot != NULL) {
-    delete snapshot_;
-    snapshot_ = original_snapshot;
-  }
-}
-
-
-HeapSnapshot* HeapSnapshotJSONSerializer::CreateFakeSnapshot() {
-  HeapSnapshot* result = new HeapSnapshot(snapshot_->collection(),
-                                          HeapSnapshot::kFull,
-                                          snapshot_->title(),
-                                          snapshot_->uid());
-  result->AllocateEntries(2, 1, 0);
-  HeapEntry* root = result->AddRootEntry(1);
-  HeapEntry* message = result->AddEntry(
-      HeapEntry::kString, "The snapshot is too big", 0, 4, 0, 0);
-  root->SetUnidirElementReference(0, 1, message);
-  result->SetDominatorsToSelf();
-  return result;
 }