A64: Synchronize with r17441.

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index 62a7e57fb367865fb5e8eedf31fb7d2adef05d63..4516fa2d7ebd86fa87c15fab60559150ddd8c135 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -142,8 +142,7 @@ class PlatformFeatureScope BASE_EMBEDDED {
   ~PlatformFeatureScope();
 
  private:
-  uint64_t old_supported_;
-  uint64_t old_found_by_runtime_probing_only_;
+  uint64_t old_cross_compile_;
 };
 
 
@@ -402,6 +401,7 @@ class RelocInfo BASE_EMBEDDED {
   INLINE(Handle<Cell> target_cell_handle());
   INLINE(void set_target_cell(Cell* cell,
                               WriteBarrierMode mode = UPDATE_WRITE_BARRIER));
+  INLINE(Handle<Object> code_age_stub_handle(Assembler* origin));
   INLINE(Code* code_age_stub());
   INLINE(void set_code_age_stub(Code* stub));
 
@@ -728,6 +728,10 @@ class ExternalReference BASE_EMBEDDED {
   static ExternalReference date_cache_stamp(Isolate* isolate);
 
   static ExternalReference get_make_code_young_function(Isolate* isolate);
+  static ExternalReference get_mark_code_as_executed_function(Isolate* isolate);
+
+  // New heap objects tracking support.
+  static ExternalReference record_object_allocation_function(Isolate* isolate);
 
   // Deoptimization support.
   static ExternalReference new_deoptimizer_function(Isolate* isolate);
@@ -811,6 +815,7 @@ class ExternalReference BASE_EMBEDDED {
   static ExternalReference address_of_negative_infinity();
   static ExternalReference address_of_canonical_non_hole_nan();
   static ExternalReference address_of_the_hole_nan();
+  static ExternalReference address_of_uint32_bias();
 
   static ExternalReference math_sin_double_function(Isolate* isolate);
   static ExternalReference math_cos_double_function(Isolate* isolate);