Use log prints for simulation tracing and fix --disassemble-stubs.

runtime/vm/simulator_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 <setjmp.h>  // NOLINT
 #include <stdlib.h>
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_ARM64)
 
@@ skipping 1585 matching lines @@
 typedef void (*SimulatorNativeCall)(NativeArguments* arguments, uword target);
 
 
 void Simulator::DoRedirectedCall(Instr* instr) {
   SimulatorSetjmpBuffer buffer(this);
   if (!setjmp(buffer.buffer_)) {
     int64_t saved_lr = get_register(LR);
     Redirection* redirection = Redirection::FromHltInstruction(instr);
     uword external = redirection->external_function();
     if (IsTracingExecution()) {
-      OS::Print("Call to host function at 0x%" Pd "\n", external);
+      THR_Print("Call to host function at 0x%" Pd "\n", external);
     }
 
     if ((redirection->call_kind() == kRuntimeCall) ||
         (redirection->call_kind() == kBootstrapNativeCall) ||
         (redirection->call_kind() == kNativeCall)) {
       // Set the top_exit_frame_info of this simulator to the native stack.
       set_top_exit_frame_info(Thread::GetCurrentStackPointer());
     }
     if (redirection->call_kind() == kRuntimeCall) {
       NativeArguments* arguments =
@@ skipping 1782 matching lines @@
   } else {
     UnimplementedInstruction(instr);
   }
 }
 
 
 // Executes the current instruction.
 void Simulator::InstructionDecode(Instr* instr) {
   pc_modified_ = false;
   if (IsTracingExecution()) {
-    OS::Print("%" Pu64 " ", icount_);
+    THR_Print("%" Pu64 " ", icount_);
     const uword start = reinterpret_cast<uword>(instr);
     const uword end = start + Instr::kInstrSize;
     if (FLAG_support_disassembler) {
       Disassembler::Disassemble(start, end);
     } else {
-      OS::Print("Disassembler not supported in this mode.\n");
+      THR_Print("Disassembler not supported in this mode.\n");
     }
   }
 
   if (instr->IsDPImmediateOp()) {
     DecodeDPImmediate(instr);
   } else if (instr->IsCompareBranchOp()) {
     DecodeCompareBranch(instr);
   } else if (instr->IsLoadStoreOp()) {
     DecodeLoadStore(instr);
   } else if (instr->IsDPRegisterOp()) {
@@ skipping 179 matching lines @@
   set_register(NULL, kExceptionObjectReg, bit_cast<int64_t>(raw_exception));
   set_register(NULL, kStackTraceObjectReg, bit_cast<int64_t>(raw_stacktrace));
   buf->Longjmp();
 }
 
 }  // namespace dart
 
 #endif  // !defined(USING_SIMULATOR)
 
 #endif  // defined TARGET_ARCH_ARM64