Consistently make the bounds check for AccessArgumentsAt explicit.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 628d987a3408b28bca85d250c57d8dfaf710692e..374e54c97389e448721421ca80898aeb6d42df1d 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -9016,8 +9016,10 @@ void HGraphBuilder::GenerateArguments(CallRuntime* call) {
   HInstruction* elements = AddInstruction(
       new(zone()) HArgumentsElements(false));
   HInstruction* length = AddInstruction(new(zone()) HArgumentsLength(elements));
+  HInstruction* checked_index =
+      AddInstruction(new(zone()) HBoundsCheck(index, length));
   HAccessArgumentsAt* result =
-      new(zone()) HAccessArgumentsAt(elements, length, index);
+      new(zone()) HAccessArgumentsAt(elements, length, checked_index);
   return ast_context()->ReturnInstruction(result, call->id());
 }