VM: Set breakpoints on x64 and arm64 without patching code.

runtime/vm/assembler_arm64.h

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_ASSEMBLER_ARM64_H_
 #define VM_ASSEMBLER_ARM64_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_arm64.h directly; use assembler.h instead.
 #endif
@@ skipping 1283 matching lines @@
                                 const Address& dest,
                                 const Object& value);
   void StoreIntoObjectOffsetNoBarrier(Register object,
                                       int32_t offset,
                                       const Object& value,
                                       Register pp);
 
   // Object pool, loading from pool, etc.
   void LoadPoolPointer(Register pp);
 
-  // Index of constant pool entries pointing to debugger stubs.
-  static const int kICCallBreakpointCPIndex = 5;
-  static const int kClosureCallBreakpointCPIndex = 6;
-  static const int kRuntimeCallBreakpointCPIndex = 7;
-
   bool allow_constant_pool() const {
     return allow_constant_pool_;
   }
   void set_allow_constant_pool(bool b) {
     allow_constant_pool_ = b;
   }
 
   void LoadWordFromPoolOffset(Register dst, Register pp, uint32_t offset);
   void LoadWordFromPoolOffsetFixed(Register dst, Register pp, uint32_t offset);
   intptr_t FindImmediate(int64_t imm);
@@ skipping 622 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM64_H_