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

runtime/vm/assembler_ia32.h

 // 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.
 
 #ifndef RUNTIME_VM_ASSEMBLER_IA32_H_
 #define RUNTIME_VM_ASSEMBLER_IA32_H_
 
 #ifndef RUNTIME_VM_ASSEMBLER_H_
 #error Do not include assembler_ia32.h directly; use assembler.h instead.
 #endif
@@ skipping 765 matching lines @@
   void Bind(Label* label);
   void Jump(Label* label) { jmp(label); }
 
   // Address of code at offset.
   uword CodeAddress(intptr_t offset) {
     return buffer_.Address(offset);
   }
 
   intptr_t CodeSize() const { return buffer_.Size(); }
   intptr_t prologue_offset() const { return prologue_offset_; }
+  bool has_single_entry_point() const { return true; }
 
   // Count the fixups that produce a pointer offset, without processing
   // the fixups.
   intptr_t CountPointerOffsets() const {
     return buffer_.CountPointerOffsets();
   }
   const ZoneGrowableArray<intptr_t>& GetPointerOffsets() const {
     return buffer_.pointer_offsets();
   }
 
@@ skipping 223 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_ASSEMBLER_IA32_H_