A64: Synchronize with r16489.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 5be7861a6884c73db274e404dc965e10347f8f27..4071ef67214f277bbea6b5b26e7246f0d024067a 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -78,9 +78,9 @@ namespace internal {
   V(DescriptorArray, empty_descriptor_array, EmptyDescriptorArray)             \
   V(Smi, stack_limit, StackLimit)                                              \
   V(Oddball, arguments_marker, ArgumentsMarker)                                \
-  /* The first 32 roots above this line should be boring from a GC point of */ \
-  /* view.  This means they are never in new space and never on a page that */ \
-  /* is being compacted.                                                    */ \
+  /* The roots above this line should be boring from a GC point of view.    */ \
+  /* This means they are never in new space and never on a page that is     */ \
+  /* being compacted.                                                       */ \
   V(FixedArray, number_string_cache, NumberStringCache)                        \
   V(Object, instanceof_cache_function, InstanceofCacheFunction)                \
   V(Object, instanceof_cache_map, InstanceofCacheMap)                          \
@@ -523,7 +523,7 @@ 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.
@@ -1871,7 +1871,7 @@ class Heap {
 
   void CheckpointObjectStats();
 
-  // We don't use a ScopedLock here since we want to lock the heap
+  // We don't use a LockGuard here since we want to lock the heap
   // only when FLAG_concurrent_recompilation is true.
   class RelocationLock {
    public: