Remove the dependency of Zone on Isolate

src/compiler/zone-pool.cc

Index: src/compiler/zone-pool.cc
diff --git a/src/compiler/zone-pool.cc b/src/compiler/zone-pool.cc
index 179988d418f15a469b775a26a2d72065f2a4ad72..c1fd47a80455d7792a59f00fb7e70c92943a1513 100644
--- a/src/compiler/zone-pool.cc
+++ b/src/compiler/zone-pool.cc
@@ -66,7 +66,7 @@ void ZonePool::StatsScope::ZoneReturned(Zone* zone) {
 
 
 ZonePool::ZonePool(Isolate* isolate)

[Michael Starzinger, 2015/01/23 14:21:10]

remark: Looks like we can also drop the Isolate parameter from the ZonePool now,
but that is for a separate CL, just wanted to point it out.

[danno, 2015/01/23 14:45:20]

Done.

-    : isolate_(isolate), max_allocated_bytes_(0), total_deleted_bytes_(0) {}
+    : max_allocated_bytes_(0), total_deleted_bytes_(0) {}
 
 
 ZonePool::~ZonePool() {
@@ -104,7 +104,7 @@ Zone* ZonePool::NewEmptyZone() {
     zone = unused_.back();
     unused_.pop_back();
   } else {
-    zone = new Zone(isolate_);
+    zone = new Zone();
   }
   used_.push_back(zone);
   DCHECK_EQ(0, zone->allocation_size());