Adds debugger patching to arm64.

runtime/vm/stub_code_arm64.cc

 // 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.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 1623 matching lines @@
 
   __ LoadFieldFromOffset(R2, R0, Function::code_offset(), kNoPP);
   __ LoadFieldFromOffset(R2, R2, Code::instructions_offset(), kNoPP);
   __ AddImmediate(
       R2, R2, Instructions::HeaderSize() - kHeapObjectTag, kNoPP);
   __ br(R2);
 }
 
 
 void StubCode::GenerateBreakpointRuntimeStub(Assembler* assembler) {
-  __ Stop("GenerateBreakpointRuntimeStub");
+  __ EnterStubFrame();
+  __ Push(R5);  // Save IC Data.
+  __ Push(R4);  // Save arg. desc.
+  __ PushObject(Object::null_object(), PP);  // Space for result.
+  __ CallRuntime(kBreakpointRuntimeHandlerRuntimeEntry, 0);
+  __ Pop(R0);
+  __ Pop(R4);
+  __ Pop(R5);
+  __ LeaveStubFrame();
+  __ br(R0);
 }
 
 
 // Called only from unoptimized code. All relevant registers have been saved.
 void StubCode::GenerateDebugStepCheckStub(
     Assembler* assembler) {
   // Check single stepping.
   Label not_stepping;
   __ LoadFieldFromOffset(R1, CTX, Context::isolate_offset(), kNoPP);
   __ LoadFromOffset(
@@ skipping 252 matching lines @@
   const Register right = R0;
   __ LoadFromOffset(left, SP, 1 * kWordSize, kNoPP);
   __ LoadFromOffset(right, SP, 0 * kWordSize, kNoPP);
   GenerateIdenticalWithNumberCheckStub(assembler, left, right, temp);
   __ ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64