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

runtime/vm/raw_object.cc

 // Copyright (c) 2012, 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/raw_object.h"
 
 #include "vm/become.h"
 #include "vm/class_table.h"
 #include "vm/dart.h"
 #include "vm/freelist.h"
@@ skipping 50 matching lines @@
     case kCodeCid: {
       const RawCode* raw_code = reinterpret_cast<const RawCode*>(this);
       intptr_t pointer_offsets_length =
           Code::PtrOffBits::decode(raw_code->ptr()->state_bits_);
       instance_size = Code::InstanceSize(pointer_offsets_length);
       break;
     }
     case kInstructionsCid: {
       const RawInstructions* raw_instructions =
           reinterpret_cast<const RawInstructions*>(this);
-      intptr_t instructions_size = raw_instructions->ptr()->size_;
+      intptr_t instructions_size = abs(raw_instructions->ptr()->size_);
       instance_size = Instructions::InstanceSize(instructions_size);
       break;
     }
     case kContextCid: {
       const RawContext* raw_context =
           reinterpret_cast<const RawContext*>(this);
       intptr_t num_variables = raw_context->ptr()->num_variables_;
       instance_size = Context::InstanceSize(num_variables);
       break;
     }
@@ skipping 485 matching lines @@
       visitor->VisitPointer(&(first + i)->raw_obj_);
     }
   }
   return ObjectPool::InstanceSize(raw_obj->ptr()->length_);
 }
 
 
 intptr_t RawInstructions::VisitInstructionsPointers(
     RawInstructions* raw_obj, ObjectPointerVisitor* visitor) {
   RawInstructions* obj = raw_obj->ptr();
-  return Instructions::InstanceSize(obj->size_);
+  return Instructions::InstanceSize(abs(obj->size_));
 }
 
 
 bool RawInstructions::ContainsPC(RawInstructions* raw_instr, uword pc) {
   uword start_pc =
       reinterpret_cast<uword>(raw_instr->ptr()) + Instructions::HeaderSize();
-  uword end_pc = start_pc + raw_instr->ptr()->size_;
+  uword end_pc = start_pc + abs(raw_instr->ptr()->size_);
   ASSERT(end_pc > start_pc);
   return (pc >= start_pc) && (pc < end_pc);
 }
 
 
 intptr_t RawPcDescriptors::VisitPcDescriptorsPointers(
     RawPcDescriptors* raw_obj, ObjectPointerVisitor* visitor) {
   return PcDescriptors::InstanceSize(raw_obj->ptr()->length_);
 }
 
@@ skipping 376 matching lines @@
 intptr_t RawUserTag::VisitUserTagPointers(
     RawUserTag* raw_obj, ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
   ASSERT(raw_obj->IsHeapObject());
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return UserTag::InstanceSize();
 }
 
 
 }  // namespace dart