Emit mementos in crankshaft.

test/mjsunit/array-constructor-feedback.js

Index: test/mjsunit/array-constructor-feedback.js
diff --git a/test/mjsunit/array-constructor-feedback.js b/test/mjsunit/array-constructor-feedback.js
index 9bc62e447a79a86f78fdff3455ec8efb0f59a0ea..19730c21729d9e2fb64d2c1066c13cfcf7525d9b 100644
--- a/test/mjsunit/array-constructor-feedback.js
+++ b/test/mjsunit/array-constructor-feedback.js
@@ -190,6 +190,8 @@ if (support_smi_only_arrays) {
       %DebugPrint(3);
       b[0] = 3.5;
       c = bar();
+      // This assert should be relaxed as we may continue emitting mementos for
+      // pretenuring purposes in crankshaft if we don't have enough samples yet.
       assertKind(elements_kind.fast_smi_only, c);
       assertOptimized(bar);
     }