Replace C++ bitfields with our own BitFields

src/profile-generator.cc

Index: src/profile-generator.cc
diff --git a/src/profile-generator.cc b/src/profile-generator.cc
index 6017f12dc67ece8ac7e51383e2479b4f36721dcb..4607156a4e0ee320f8d7190f72176c3f7df6030a 100644
--- a/src/profile-generator.cc
+++ b/src/profile-generator.cc
@@ -143,7 +143,7 @@ CodeEntry::~CodeEntry() {
 
 
 uint32_t CodeEntry::GetCallUid() const {
-  uint32_t hash = ComputeIntegerHash(tag_, v8::internal::kZeroHashSeed);
+  uint32_t hash = ComputeIntegerHash(tag(), v8::internal::kZeroHashSeed);
   if (shared_id_ != 0) {
     hash ^= ComputeIntegerHash(static_cast<uint32_t>(shared_id_),
                                v8::internal::kZeroHashSeed);
@@ -164,20 +164,18 @@ uint32_t CodeEntry::GetCallUid() const {
 
 
 bool CodeEntry::IsSameAs(CodeEntry* entry) const {
-  return this == entry
-      || (tag_ == entry->tag_
-          && shared_id_ == entry->shared_id_
-          && (shared_id_ != 0
-              || (name_prefix_ == entry->name_prefix_
-                  && name_ == entry->name_
-                  && resource_name_ == entry->resource_name_
-                  && line_number_ == entry->line_number_)));
+  return this == entry ||
+         (tag() == entry->tag() && shared_id_ == entry->shared_id_ &&
+          (shared_id_ != 0 ||
+           (name_prefix_ == entry->name_prefix_ && name_ == entry->name_ &&
+            resource_name_ == entry->resource_name_ &&
+            line_number_ == entry->line_number_)));
 }
 
 
 void CodeEntry::SetBuiltinId(Builtins::Name id) {
-  tag_ = Logger::BUILTIN_TAG;
-  builtin_id_ = id;
+  bit_field_ = TagField::update(bit_field_, Logger::BUILTIN_TAG);
+  bit_field_ = BuiltinIdField::update(bit_field_, id);
 }