Make HJSArrayLength more likely to have identical GVNs.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index d9590a946e28a21ae10120df6f243c03f901ac97..6e479979084d108beaf90b46a2989dcc6bfb1e32 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -1036,6 +1036,17 @@ void HJSArrayLength::PrintDataTo(StringStream* stream) {
 }
 
 
+HJSArrayLength* HJSArrayLength::Create(HGraph* graph,
+                                       HValue* value,
+                                       HValue* typecheck,
+                                       HType type) {
+  HJSArrayLength* result = new(graph->zone())
+      HJSArrayLength(value, typecheck, type);
+  graph->RecordJSArrayLength(result);
+  return result;
+}
+
+
 HValue* HUnaryMathOperation::Canonicalize() {
   if (op() == kMathFloor) {
     // If the input is integer32 then we replace the floor instruction