One Zone per CompilationInfo.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 8fcb370c3e9ebf9fc5894a4b0826b1339966c60a..2a57e2cf7b48305afa62eaf8a41738664832d298 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1470,6 +1470,7 @@ Isolate::Isolate()
       descriptor_lookup_cache_(NULL),
       handle_scope_implementer_(NULL),
       unicode_cache_(NULL),
+      runtime_zone_(this),
       in_use_list_(0),
       free_list_(0),
       preallocated_storage_preallocated_(false),
@@ -1490,7 +1491,6 @@ Isolate::Isolate()
       sizeof(isolate_addresses_[0]) * (kIsolateAddressCount + 1));
 
   heap_.isolate_ = this;
-  zone_.isolate_ = this;
   stack_guard_.isolate_ = this;
 
   // ThreadManager is initialized early to support locking an isolate
@@ -1606,7 +1606,7 @@ Isolate::~Isolate() {
   TRACE_ISOLATE(destructor);
 
   // Has to be called while counters_ are still alive.
-  zone_.DeleteKeptSegment();
+  runtime_zone_.DeleteKeptSegment();
 
   delete[] assembler_spare_buffer_;
   assembler_spare_buffer_ = NULL;
@@ -1778,7 +1778,7 @@ bool Isolate::Init(Deserializer* des) {
   global_handles_ = new GlobalHandles(this);
   bootstrapper_ = new Bootstrapper();
   handle_scope_implementer_ = new HandleScopeImplementer(this);
-  stub_cache_ = new StubCache(this, zone());
+  stub_cache_ = new StubCache(this, runtime_zone());
   regexp_stack_ = new RegExpStack();
   regexp_stack_->isolate_ = this;
   date_cache_ = new DateCache();