Reland of "[heap] Switch to 500k pages"

test/cctest/heap/test-page-promotion.cc

Index: test/cctest/heap/test-page-promotion.cc
diff --git a/test/cctest/heap/test-page-promotion.cc b/test/cctest/heap/test-page-promotion.cc
index a42e315a1c0959c7cd01f006bd74a21907b2feae..ccb3691e34d66fade85c646d6248d48ba96a6fdf 100644
--- a/test/cctest/heap/test-page-promotion.cc
+++ b/test/cctest/heap/test-page-promotion.cc
@@ -21,7 +21,7 @@ namespace {
 v8::Isolate* NewIsolateForPagePromotion() {
   i::FLAG_page_promotion = true;
   i::FLAG_page_promotion_threshold = 0;  // %
-  i::FLAG_min_semi_space_size = 8 * (i::Page::kPageSize / i::MB);
+  i::FLAG_min_semi_space_size = 8;
   // We cannot optimize for size as we require a new space with more than one
   // page.
   i::FLAG_optimize_for_size = false;
@@ -109,7 +109,6 @@ UNINITIALIZED_TEST(PagePromotion_NewToNewJSArrayBuffer) {
 
     // Fill the current page which potentially contains the age mark.
     heap::FillCurrentPage(heap->new_space());
-
     // Allocate a buffer we would like to check against.
     Handle<JSArrayBuffer> buffer =
         i_isolate->factory()->NewJSArrayBuffer(SharedFlag::kNotShared);