Rollback of r15097, r15087 in trunk branch.

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index 1d4ed5f32956b43d0ae4b72a6015774c29076374..fbb9c6ef8bb232f80238735b60a7665260115c17 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -929,7 +929,7 @@ LEnvironment* LChunkBuilder::CreateEnvironment(
   BailoutId ast_id = hydrogen_env->ast_id();
   ASSERT(!ast_id.IsNone() ||
          hydrogen_env->frame_type() != JS_FUNCTION);
-  int value_count = hydrogen_env->length() - hydrogen_env->specials_count();
+  int value_count = hydrogen_env->length();
   LEnvironment* result = new(zone()) LEnvironment(
       hydrogen_env->closure(),
       hydrogen_env->frame_type(),
@@ -940,15 +940,13 @@ LEnvironment* LChunkBuilder::CreateEnvironment(
       outer,
       hydrogen_env->entry(),
       zone());
-  bool needs_arguments_object_materialization = false;
   int argument_index = *argument_index_accumulator;
-  for (int i = 0; i < hydrogen_env->length(); ++i) {
+  for (int i = 0; i < value_count; ++i) {
     if (hydrogen_env->is_special_index(i)) continue;
 
     HValue* value = hydrogen_env->values()->at(i);
     LOperand* op = NULL;
     if (value->IsArgumentsObject()) {
-      needs_arguments_object_materialization = true;
       op = NULL;
     } else if (value->IsPushArgument()) {
       op = new(zone()) LArgument(argument_index++);
@@ -960,22 +958,6 @@ LEnvironment* LChunkBuilder::CreateEnvironment(
                      value->CheckFlag(HInstruction::kUint32));
   }
 
-  if (needs_arguments_object_materialization) {
-    HArgumentsObject* arguments = hydrogen_env->entry() == NULL
-        ? graph()->GetArgumentsObject()
-        : hydrogen_env->entry()->arguments_object();
-    ASSERT(arguments->IsLinked());
-    for (int i = 1; i < arguments->arguments_count(); ++i) {
-      HValue* value = arguments->arguments_values()->at(i);
-      ASSERT(!value->IsArgumentsObject() && !value->IsPushArgument());
-      ASSERT(HInstruction::cast(value)->IsLinked());
-      LOperand* op = UseAny(value);
-      result->AddValue(op,
-                       value->representation(),
-                       value->CheckFlag(HInstruction::kUint32));
-    }
-  }
-
   if (hydrogen_env->frame_type() == JS_FUNCTION) {
     *argument_index_accumulator = argument_index;
   }