The --optimize-for-size flag should imply a small semi-space

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index 8852b8820ffa19573fdcd26bb4a661bdab1acc42..31d817c924c2a5d5e004e5273cb850186f2987b8 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -4360,7 +4360,7 @@ TEST(PromotionQueue) {
 
   // In this test we will try to overwrite the promotion queue which is at the
   // end of to-space. To actually make that possible, we need at least two
-  // semi-space pages and take advantage of fragementation.
+  // semi-space pages and take advantage of fragmentation.
   // (1) Grow semi-space to two pages.
   // (2) Create a few small long living objects and call the scavenger to
   // move them to the other semi-space.
@@ -4380,6 +4380,12 @@ TEST(PromotionQueue) {
   // Grow the semi-space to two pages to make semi-space copy overwrite the
   // promotion queue, which will be at the end of the second page.
   intptr_t old_capacity = new_space->Capacity();
+
+  // If we are in a low memory config, we can't grow to two pages and we can't
+  // run this test. This also means the issue we are testing cannot arise, as
+  // there is no fragmentation.
+  if (new_space->IsAtMaximumCapacity()) return;
+
   new_space->Grow();
   CHECK(new_space->IsAtMaximumCapacity());
   CHECK(2 * old_capacity == new_space->Capacity());