Remove default monomorphic check code from functions and stubs that do not need it.

runtime/vm/assembler_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"  // NOLINT
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/longjump.h"
 #include "vm/runtime_entry.h"
 #include "vm/simulator.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 
 namespace dart {
 
 DECLARE_FLAG(bool, check_code_pointer);
 DECLARE_FLAG(bool, inline_alloc);
 
 DEFINE_FLAG(bool, use_far_branches, false, "Always use far branches");
 
 
 Assembler::Assembler(bool use_far_branches)
     : buffer_(),
       prologue_offset_(-1),
+      has_single_entry_point_(true),
       use_far_branches_(use_far_branches),
       comments_(),
       constant_pool_allowed_(false) {
-  MonomorphicCheckedEntry();
 }
 
 
 void Assembler::InitializeMemoryWithBreakpoints(uword data, intptr_t length) {
   ASSERT(Utils::IsAligned(data, 4));
   ASSERT(Utils::IsAligned(length, 4));
   const uword end = data + length;
   while (data < end) {
     *reinterpret_cast<int32_t*>(data) = Instr::kBreakPointInstruction;
     data += 4;
@@ skipping 1190 matching lines @@
 void Assembler::EnterStubFrame() {
   EnterDartFrame(0);
 }
 
 
 void Assembler::LeaveStubFrame() {
   LeaveDartFrame();
 }
 
 
-void Assembler::NoMonomorphicCheckedEntry() {
-  buffer_.Reset();
-  brk(0);
-  brk(0);
-  brk(0);
-  brk(0);
-  ASSERT(CodeSize() == Instructions::kCheckedEntryOffset);
-}
-
-
 // R0 receiver, R5 guarded cid as Smi
 void Assembler::MonomorphicCheckedEntry() {
+  ASSERT(has_single_entry_point_);
+  has_single_entry_point_ = false;
   bool saved_use_far_branches = use_far_branches();
   set_use_far_branches(false);
 
   Label immediate, have_cid, miss;
   Bind(&miss);
   ldr(IP0, Address(THR, Thread::monomorphic_miss_entry_offset()));
   br(IP0);
 
   Bind(&immediate);
   movz(R4, Immediate(kSmiCid), 0);
@@ skipping 311 matching lines @@
   str(tmp, Address(addr, 7), kUnsignedByte);
   if (sz == kDoubleWord) {
     return;
   }
   UNIMPLEMENTED();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64