Bump MaxRegularSpaceAllocationSize to InitialSemiSpaceSize() * 4/5

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 14b395f9345008e5f37ffd3345b59fb73f23ee51..8bacefc2fc34ed7483b63abfd2cde60e74687281 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -524,7 +524,7 @@ class Heap {
   int InitialSemiSpaceSize() { return initial_semispace_size_; }
   intptr_t MaxOldGenerationSize() { return max_old_generation_size_; }
   intptr_t MaxExecutableSize() { return max_executable_size_; }
-  int MaxRegularSpaceAllocationSize() { return InitialSemiSpaceSize() * 3/4; }
+  int MaxRegularSpaceAllocationSize() { return InitialSemiSpaceSize() * 4/5; }
 
   // Returns the capacity of the heap in bytes w/o growing. Heap grows when
   // more spaces are needed until it reaches the limit.