[ic] Split megamorphic stub cache in two caches (for loads and for stores).

src/isolate.h

 // Copyright 2012 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.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <memory>
 #include <queue>
 #include <set>
@@ skipping 820 matching lines @@
   CompilationCache* compilation_cache() { return compilation_cache_; }
   Logger* logger() {
     // Call InitializeLoggingAndCounters() if logging is needed before
     // the isolate is fully initialized.
     DCHECK(logger_ != NULL);
     return logger_;
   }
   StackGuard* stack_guard() { return &stack_guard_; }
   Heap* heap() { return &heap_; }
   StatsTable* stats_table();
-  StubCache* stub_cache() { return stub_cache_; }
+  StubCache* load_stub_cache() { return load_stub_cache_; }
+  StubCache* store_stub_cache() { return store_stub_cache_; }
   CodeAgingHelper* code_aging_helper() { return code_aging_helper_; }
   DeoptimizerData* deoptimizer_data() { return deoptimizer_data_; }
   bool deoptimizer_lazy_throw() const { return deoptimizer_lazy_throw_; }
   void set_deoptimizer_lazy_throw(bool value) {
     deoptimizer_lazy_throw_ = value;
   }
   ThreadLocalTop* thread_local_top() { return &thread_local_top_; }
   MaterializedObjectStore* materialized_object_store() {
     return materialized_object_store_;
   }
@@ skipping 421 matching lines @@
   StringStream* incomplete_message_;
   Address isolate_addresses_[kIsolateAddressCount + 1];  // NOLINT
   Bootstrapper* bootstrapper_;
   RuntimeProfiler* runtime_profiler_;
   CompilationCache* compilation_cache_;
   Counters* counters_;
   base::RecursiveMutex break_access_;
   Logger* logger_;
   StackGuard stack_guard_;
   StatsTable* stats_table_;
-  StubCache* stub_cache_;
+  StubCache* load_stub_cache_;
+  StubCache* store_stub_cache_;
   CodeAgingHelper* code_aging_helper_;
   DeoptimizerData* deoptimizer_data_;
   bool deoptimizer_lazy_throw_;
   MaterializedObjectStore* materialized_object_store_;
   ThreadLocalTop thread_local_top_;
   bool capture_stack_trace_for_uncaught_exceptions_;
   int stack_trace_for_uncaught_exceptions_frame_limit_;
   StackTrace::StackTraceOptions stack_trace_for_uncaught_exceptions_options_;
   KeyedLookupCache* keyed_lookup_cache_;
   ContextSlotCache* context_slot_cache_;
@@ skipping 348 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_