[instruction scheduler] fix ArchDebugBreak.

src/arm64/assembler-arm64.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
@@ skipping 2330 matching lines @@
     DCHECK(SizeOfCodeGeneratedSince(&start) == kDebugMessageOffset);
     EmitStringData(message);
     hlt(kImmExceptionIsUnreachable);
 
     return;
   }
   // Fall through if Serializer is enabled.
 #endif
 
   if (params & BREAK) {
-    hlt(kImmExceptionIsDebug);
+    brk(0);
   }
 }
 
 
 void Assembler::Logical(const Register& rd,
                         const Register& rn,
                         const Operand& operand,
                         LogicalOp op) {
   DCHECK(rd.SizeInBits() == rn.SizeInBits());
   DCHECK(!operand.NeedsRelocation(this));
@@ skipping 862 matching lines @@
   movk(scratch, (target_offset >> 32) & 0xFFFF, 32);
   DCHECK((target_offset >> 48) == 0);
   add(rd, rd, scratch);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64