Remove the dependency of Zone on Isolate

test/cctest/compiler/test-jump-threading.cc

Index: test/cctest/compiler/test-jump-threading.cc
diff --git a/test/cctest/compiler/test-jump-threading.cc b/test/cctest/compiler/test-jump-threading.cc
index 4365170395161ea54b00774bb87ee1cbfc5013db..894c9c7e3ebec8f7c95b10aa919624f5e87c2670 100644
--- a/test/cctest/compiler/test-jump-threading.cc
+++ b/test/cctest/compiler/test-jump-threading.cc
@@ -20,7 +20,7 @@ class TestCode : public HandleAndZoneScope {
   TestCode()
       : HandleAndZoneScope(),
         blocks_(main_zone()),
-        sequence_(main_zone(), &blocks_),
+        sequence_(main_isolate(), main_zone(), &blocks_),
         rpo_number_(RpoNumber::FromInt(0)),
         current_(NULL) {}
 
@@ -102,7 +102,7 @@ class TestCode : public HandleAndZoneScope {
 
 
 void VerifyForwarding(TestCode& code, int count, int* expected) {
-  Zone local_zone(code.main_isolate());
+  Zone local_zone;
   ZoneVector<RpoNumber> result(&local_zone);
   JumpThreading::ComputeForwarding(&local_zone, result, &code.sequence_);