Introduce an option to do regular new space growing for a while

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index 30b141fcd32965637bd6ed1a2cc29284dff33750..ea6d662fa0706ee09a9199e354f24c89c2b2c11e 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -1398,7 +1398,8 @@ bool NewSpace::AddFreshPage() {
   if (!to_space_.AdvancePage()) {
     // Check if we reached the target capacity yet. If not, try to commit a page
     // and continue.
-    if ((to_space_.TotalCapacity() < to_space_.TargetCapacity()) &&
+    if (grow_to_target_capacity_ &&
+        (to_space_.TotalCapacity() < to_space_.TargetCapacity()) &&
         GrowOnePage()) {
       if (!to_space_.AdvancePage()) {
         // It doesn't make sense that we managed to commit a page, but can't use