[heap] Fix checks in NewSpace::EnsureAllocation.

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index 54b7696835dc2652841cc26c7a13376820bda376..7cea884dc10aa1aaad164ab27d896f96928460b6 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -1501,7 +1501,7 @@ bool NewSpace::EnsureAllocation(int size_in_bytes,
   int filler_size = Heap::GetFillToAlign(old_top, alignment);
   int aligned_size_in_bytes = size_in_bytes + filler_size;
 
-  if (old_top + aligned_size_in_bytes >= high) {
+  if (old_top + aligned_size_in_bytes > high) {
     // Not enough room in the page, try to allocate a new one.
     if (!AddFreshPage()) {
       return false;
@@ -1512,10 +1512,9 @@ bool NewSpace::EnsureAllocation(int size_in_bytes,
     old_top = allocation_info_.top();
     high = to_space_.page_high();
     filler_size = Heap::GetFillToAlign(old_top, alignment);
-    aligned_size_in_bytes = size_in_bytes + filler_size;
   }
 
-  DCHECK(old_top + aligned_size_in_bytes < high);
+  DCHECK(old_top + aligned_size_in_bytes <= high);
 
   if (allocation_info_.limit() < high) {
     // Either the limit has been lowered because linear allocation was disabled