[Isolates] Convert more static data either to read-only or to per-isolate.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 74653649d20c9acfb82d49602848698d04dc2b33..cb1807ea7a497d3a4398fdbe48f3313c146898c5 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -337,6 +337,7 @@ Isolate::Isolate()
       in_use_list_(0),
       free_list_(0),
       preallocated_storage_preallocated_(false),
+      pc_to_code_cache_(NULL),
       write_input_buffer_(NULL),
       global_handles_(NULL),
       context_switcher_(NULL),
@@ -487,6 +488,8 @@ Isolate::~Isolate() {
   compilation_cache_ = NULL;
   delete bootstrapper_;
   bootstrapper_ = NULL;
+  delete pc_to_code_cache_;
+  pc_to_code_cache_ = NULL;
   delete write_input_buffer_;
   write_input_buffer_ = NULL;
 
@@ -554,6 +557,7 @@ bool Isolate::PreInit() {
   context_slot_cache_ = new ContextSlotCache();
   descriptor_lookup_cache_ = new DescriptorLookupCache();
   scanner_character_classes_ = new ScannerCharacterClasses();
+  pc_to_code_cache_ = new PcToCodeCache(this);
   write_input_buffer_ = new StringInputBuffer();
   global_handles_ = new GlobalHandles();
   bootstrapper_ = new Bootstrapper();