A64: Synchronize with r18084.

src/a64/macro-assembler-a64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4006 matching lines @@
   // context register, so we check that none of the clobbered
   // registers are cp.
   ASSERT(!address.is(cp) && !value.is(cp));
 
   if (emit_debug_code()) {
     Ldr(Tmp0(), MemOperand(address));
     Cmp(Tmp0(), value);
     Check(eq, kWrongAddressOrValuePassedToRecordWrite);
   }
 
+  // Count number of write barriers in generated code.
+  isolate()->counters()->write_barriers_static()->Increment();
+  // TODO(mstarzinger): Dynamic counter missing.
+
+  // First, check if a write barrier is even needed. The tests below
+  // catch stores of smis and stores into the young generation.
   Label done;
 
   if (smi_check == INLINE_SMI_CHECK) {
     ASSERT_EQ(0, kSmiTag);
     JumpIfSmi(value, &done);
   }
 
   CheckPageFlagClear(value,
                      value,  // Used as scratch.
                      MemoryChunk::kPointersToHereAreInterestingMask,
@@ skipping 793 matching lines @@
   }
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64