One Zone per CompilationInfo.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 3466dcf18e58daba82ba1864085f8fc0bb3042f1..20231373d181de78d3df02eedfe6f14f55d2befa 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -7494,7 +7494,9 @@ 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);
 }
 
@@ -7554,7 +7556,9 @@ 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());
   }
@@ -7565,7 +7569,9 @@ 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);
 }