One Zone per CompilationInfo.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 6314955b13749fbcc7abd71d535cc0225c9604f7..2038a0fadfaa0b030c71bca89a82dfc8a999e9ae 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -7466,7 +7466,10 @@ static bool CompileLazyHelper(CompilationInfo* info,
 
 bool SharedFunctionInfo::CompileLazy(Handle<SharedFunctionInfo> shared,
                                      ClearExceptionFlag flag) {
-  CompilationInfo info(shared);
+
+  Zone zone(shared->GetIsolate());
+  CompilationInfo info(shared, &zone);
+  ZoneScope scope(&zone, DELETE_ON_EXIT);
   return CompileLazyHelper(&info, flag);
 }
 
@@ -7478,7 +7481,9 @@ bool JSFunction::CompileLazy(Handle<JSFunction> function,
     function->ReplaceCode(function->shared()->code());
     function->shared()->set_code_age(0);
   } else {
-    CompilationInfo info(function);
+    Zone zone(function->GetIsolate());
+    CompilationInfo info(function, &zone);
+    ZoneScope scope(&zone, DELETE_ON_EXIT);
     result = CompileLazyHelper(&info, flag);
     ASSERT(!result || function->is_compiled());
   }
@@ -7489,7 +7494,9 @@ bool JSFunction::CompileLazy(Handle<JSFunction> function,
 bool JSFunction::CompileOptimized(Handle<JSFunction> function,
                                   int osr_ast_id,
                                   ClearExceptionFlag flag) {
-  CompilationInfo info(function);
+  Zone zone(function->GetIsolate());
+  CompilationInfo info(function, &zone);
+  ZoneScope scope(&zone, DELETE_ON_EXIT);
   info.SetOptimizing(osr_ast_id);
   return CompileLazyHelper(&info, flag);
 }