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

runtime/vm/code_patcher_ia32.cc

 // Copyright (c) 2012, 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.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/assembler.h"
 #include "vm/code_patcher.h"
 #include "vm/cpu.h"
@@ skipping 158 matching lines @@
 
 void CodePatcher::PatchInstanceCallAt(uword return_address,
                                       const Code& code,
                                       uword new_target) {
   ASSERT(code.ContainsInstructionAt(return_address));
   InstanceCall call(return_address);
   call.set_target(new_target);
 }
 
 
-int32_t CodePatcher::GetPoolOffsetAt(uword return_address) {
-  UNREACHABLE();
-  return 0;
-}
-
-
-void CodePatcher::SetPoolOffsetAt(uword return_address, int32_t offset) {
-  UNREACHABLE();
-}
-
-
 void CodePatcher::InsertCallAt(uword start, uword target) {
   // The inserted call should not overlap the lazy deopt jump code.
   ASSERT(start + CallPattern::InstructionLength() <= target);
   *reinterpret_cast<uint8_t*>(start) = 0xE8;
   CallPattern call(start);
   call.SetTargetAddress(target);
   CPU::FlushICache(start, CallPattern::InstructionLength());
 }
 
 
@@ skipping 50 matching lines @@
 
 RawObject* CodePatcher::GetEdgeCounterAt(uword pc, const Code& code) {
   ASSERT(code.ContainsInstructionAt(pc));
   EdgeCounter counter(pc, code);
   return counter.edge_counter();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32