Revert of Immediately cache compiled scripts.

src/objects.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 17608 matching lines @@
   return Handle<Object>(get(EntryToIndex(entry) + 1), isolate);
 }
 
 
 Handle<CompilationCacheTable> CompilationCacheTable::Put(
     Handle<CompilationCacheTable> cache, Handle<String> src,
     Handle<Context> context, LanguageMode language_mode, Handle<Object> value) {
   Isolate* isolate = cache->GetIsolate();
   Handle<SharedFunctionInfo> shared(context->closure()->shared());
   StringSharedKey key(src, shared, language_mode, RelocInfo::kNoPosition);
-  Handle<Object> k = key.AsHandle(isolate);
+  {
+    Handle<Object> k = key.AsHandle(isolate);
+    DisallowHeapAllocation no_allocation_scope;
+    int entry = cache->FindEntry(&key);
+    if (entry != kNotFound) {
+      cache->set(EntryToIndex(entry), *k);
+      cache->set(EntryToIndex(entry) + 1, *value);
+      return cache;
+    }
+  }
+
   cache = EnsureCapacity(cache, 1, &key);
   int entry = cache->FindInsertionEntry(key.Hash());
+  Handle<Object> k =
+      isolate->factory()->NewNumber(static_cast<double>(key.Hash()));
   cache->set(EntryToIndex(entry), *k);
-  cache->set(EntryToIndex(entry) + 1, *value);
+  cache->set(EntryToIndex(entry) + 1, Smi::FromInt(kHashGenerations));
   cache->ElementAdded();
   return cache;
 }
 
 
 Handle<CompilationCacheTable> CompilationCacheTable::PutEval(
     Handle<CompilationCacheTable> cache, Handle<String> src,
     Handle<SharedFunctionInfo> outer_info, Handle<SharedFunctionInfo> value,
     int scope_position) {
   Isolate* isolate = cache->GetIsolate();
@@ skipping 1720 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8