Remove (H|L)JSArrayLength instructions

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 6fac3021038d6f061df07f6c1e6b3460b3d1846c..7a386b4f71d75149a6e7065549f44295ce0eb211 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -1169,8 +1169,8 @@ HInstruction* HGraphBuilder::BuildUncheckedMonomorphicElementAccess(
   }
   HInstruction* length = NULL;
   if (is_js_array) {
-    length = AddInstruction(new(zone) HJSArrayLength(object, mapcheck,
-                                                     HType::Smi()));
+    length = AddInstruction(
+        HLoadNamedField::NewArrayLength(object, zone));
   } else {
     length = AddInstruction(new(zone) HFixedArrayBaseLength(elements));
   }
@@ -7349,8 +7349,8 @@ HValue* HOptimizedGraphBuilder::HandlePolymorphicElementAccess(
 
         set_current_block(if_jsarray);
         HInstruction* length;
-        length = AddInstruction(new(zone()) HJSArrayLength(object, typecheck,
-                                                           HType::Smi()));
+        length = AddInstruction(
+            HLoadNamedField::NewArrayLength(object, zone()));
         checked_key = AddBoundsCheck(key, length, ALLOW_SMI_KEY);
         access = AddInstruction(BuildFastElementAccess(
             elements, checked_key, val, elements_kind_branch,
@@ -7554,9 +7554,8 @@ void HOptimizedGraphBuilder::VisitProperty(Property* expr) {
   if (expr->AsProperty()->IsArrayLength()) {
     HValue* array = Pop();
     AddInstruction(new(zone()) HCheckNonSmi(array));
-    HInstruction* mapcheck =
-        AddInstruction(HCheckInstanceType::NewIsJSArray(array, zone()));
-    instr = new(zone()) HJSArrayLength(array, mapcheck);
+    AddInstruction(HCheckInstanceType::NewIsJSArray(array, zone()));
+    instr = HLoadNamedField::NewArrayLength(array, zone());
   } else if (expr->IsStringLength()) {
     HValue* string = Pop();
     AddInstruction(new(zone()) HCheckNonSmi(string));