With flag optimize-constructed-arrays on, ARM and MIPS suffered a performance degrade

test/mjsunit/allocation-site-info.js

Index: test/mjsunit/allocation-site-info.js
diff --git a/test/mjsunit/allocation-site-info.js b/test/mjsunit/allocation-site-info.js
index 5c7ae13094f939640a5e15677010ac2877161ccf..45605317fea69bfd116897c75e9a1a08fc5a9bdb 100644
--- a/test/mjsunit/allocation-site-info.js
+++ b/test/mjsunit/allocation-site-info.js
@@ -28,10 +28,6 @@
 // Flags: --allow-natives-syntax --smi-only-arrays --expose-gc
 // Flags: --track-allocation-sites --noalways-opt
 
-// TODO(mvstanton): remove --nooptimize-constructed-arrays and enable
-// the constructed array code below when the feature is turned on
-// by default.
-
 // Test element kind of objects.
 // Since --smi-only-arrays affects builtins, its default setting at compile
 // time sticks if built with snapshot.  If --smi-only-arrays is deactivated
@@ -41,7 +37,7 @@
 
 // support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6,7,8));
 support_smi_only_arrays = true;
-optimize_constructed_arrays = false;
+optimize_constructed_arrays = true;
 
 if (support_smi_only_arrays) {
   print("Tests include smi-only arrays.");