[heap] Switch to 500k pages

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 2a248b7d9134f77e001bdac44d9a7887b6c33214..9476a589fe01075b340c0422d4dc5a8706499820 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -10448,12 +10448,12 @@ class JSArray: public JSObject {
   static const int kLengthOffset = JSObject::kHeaderSize;
   static const int kSize = kLengthOffset + kPointerSize;
 
-  // 600 * KB is the Page::kMaxRegularHeapObjectSize defined in spaces.h which
+  // 300 * KB is the Page::kMaxRegularHeapObjectSize defined in spaces.h which
   // we do not want to include in objects.h
   // Note that Page::kMaxRegularHeapObjectSize has to be in sync with
   // kInitialMaxFastElementArray which is checked in a DCHECK in heap.cc.
   static const int kInitialMaxFastElementArray =
-      (600 * KB - FixedArray::kHeaderSize - kSize - AllocationMemento::kSize) /
+      (300 * KB - FixedArray::kHeaderSize - kSize - AllocationMemento::kSize) /
       kPointerSize;
 
  private: