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

runtime/vm/assembler_x64.cc

 // Copyright (c) 2013, 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_X64)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/heap.h"
 #include "vm/instructions.h"
 #include "vm/locations.h"
 #include "vm/memory_region.h"
 #include "vm/runtime_entry.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 
 namespace dart {
 
 DECLARE_FLAG(bool, check_code_pointer);
 DECLARE_FLAG(bool, inline_alloc);
 
 
 Assembler::Assembler(bool use_far_branches)
     : buffer_(),
       prologue_offset_(-1),
+      has_single_entry_point_(true),
       comments_(),
       constant_pool_allowed_(false) {
   // Far branching mode is only needed and implemented for MIPS and ARM.
   ASSERT(!use_far_branches);
-  MonomorphicCheckedEntry();
 }
 
 
 void Assembler::InitializeMemoryWithBreakpoints(uword data, intptr_t length) {
   memset(reinterpret_cast<void*>(data), Instr::kBreakPointInstruction, length);
 }
 
 
 void Assembler::call(Register reg) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
@@ skipping 3273 matching lines @@
 void Assembler::EnterStubFrame() {
   EnterDartFrame(0, kNoRegister);
 }
 
 
 void Assembler::LeaveStubFrame() {
   LeaveDartFrame();
 }
 
 
-void Assembler::NoMonomorphicCheckedEntry() {
-  buffer_.Reset();
-  for (intptr_t i = 0; i < Instructions::kCheckedEntryOffset; i++) {
-    int3();
-  }
-  ASSERT(CodeSize() == Instructions::kCheckedEntryOffset);
-}
-
-
 // RDI receiver, RBX guarded cid as Smi
 void Assembler::MonomorphicCheckedEntry() {
+  ASSERT(has_single_entry_point_);
+  has_single_entry_point_ = false;
   Label immediate, have_cid, miss;
   Bind(&miss);
   jmp(Address(THR, Thread::monomorphic_miss_entry_offset()));
 
   Bind(&immediate);
   movq(R10, Immediate(kSmiCid));
   jmp(&have_cid, kNearJump);
 
   Comment("MonomorphicCheckedEntry");
   ASSERT(CodeSize() == Instructions::kCheckedEntryOffset);
@@ skipping 437 matching lines @@
 
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfXmmRegisters));
   return xmm_reg_names[reg];
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64