Introduce IsUndefined(Isolate*) and IsTheHole(Isolate*)

src/compilation-cache.cc

Index: src/compilation-cache.cc
diff --git a/src/compilation-cache.cc b/src/compilation-cache.cc
index aca8cee9cae861a148be20ffe859752b5e746914..5aa32df6c3c3aae594db38c412f6530d3f51f64d 100644
--- a/src/compilation-cache.cc
+++ b/src/compilation-cache.cc
@@ -41,7 +41,7 @@ CompilationCache::~CompilationCache() {}
 Handle<CompilationCacheTable> CompilationSubCache::GetTable(int generation) {
   DCHECK(generation < generations_);
   Handle<CompilationCacheTable> result;
-  if (tables_[generation]->IsUndefined()) {
+  if (tables_[generation]->IsUndefined(isolate())) {
     result = CompilationCacheTable::New(isolate(), kInitialCacheSize);
     tables_[generation] = *result;
   } else {
@@ -56,7 +56,7 @@ Handle<CompilationCacheTable> CompilationSubCache::GetTable(int generation) {
 void CompilationSubCache::Age() {
   // Don't directly age single-generation caches.
   if (generations_ == 1) {
-    if (tables_[0] != isolate()->heap()->undefined_value()) {
+    if (!tables_[0]->IsUndefined(isolate())) {
       CompilationCacheTable::cast(tables_[0])->Age();
     }
     return;
@@ -73,9 +73,8 @@ void CompilationSubCache::Age() {
 
 
 void CompilationSubCache::IterateFunctions(ObjectVisitor* v) {
-  Object* undefined = isolate()->heap()->undefined_value();
   for (int i = 0; i < generations_; i++) {
-    if (tables_[i] != undefined) {
+    if (!tables_[i]->IsUndefined(isolate())) {
       reinterpret_cast<CompilationCacheTable*>(tables_[i])->IterateElements(v);
     }
   }
@@ -121,7 +120,7 @@ bool CompilationCacheScript::HasOrigin(Handle<SharedFunctionInfo> function_info,
   // If the script name isn't set, the boilerplate script should have
   // an undefined name to have the same origin.
   if (name.is_null()) {
-    return script->name()->IsUndefined();
+    return script->name()->IsUndefined(isolate());
   }
   // Do the fast bailout checks first.
   if (line_offset != script->line_offset()) return false;