One Zone per CompilationInfo.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 54a72d3c2ccd454d2a512ea51e3d780f61fe1808..461c4290a33e6ac49f29eac406314ef82b7101b1 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1473,6 +1473,7 @@ 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),
@@ -1493,7 +1494,6 @@ 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
@@ -1609,7 +1609,7 @@ 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;
@@ -1781,7 +1781,7 @@ 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();