Lower simplified StringLessThan[OrEqual] to runtime call.

test/cctest/compiler/test-simplified-lowering.cc

Index: test/cctest/compiler/test-simplified-lowering.cc
diff --git a/test/cctest/compiler/test-simplified-lowering.cc b/test/cctest/compiler/test-simplified-lowering.cc
index ed0abe05db48775e1f12a906dea9b0639e988053..cf2eab8a8b89e469eb2317336c2b4b05bae9292c 100644
--- a/test/cctest/compiler/test-simplified-lowering.cc
+++ b/test/cctest/compiler/test-simplified-lowering.cc
@@ -1051,15 +1051,17 @@ TEST(LowerReferenceEqual_to_wordeq) {
 }
 
 
-TEST(LowerStringOps_to_call_and_wordeq) {
+TEST(LowerStringOps_to_call_and_compare) {
   TestingGraph t(Type::String(), Type::String());
-  IrOpcode::Value opcode =
+  IrOpcode::Value compare_eq =
       static_cast<IrOpcode::Value>(t.machine()->WordEqual()->opcode());
-  t.CheckLoweringBinop(opcode, t.simplified()->StringEqual());
-  if (false) {  // TODO(titzer): lower StringOps to stub/runtime calls
-    t.CheckLoweringBinop(opcode, t.simplified()->StringLessThan());
-    t.CheckLoweringBinop(opcode, t.simplified()->StringLessThanOrEqual());
-  }
+  IrOpcode::Value compare_lt =
+      static_cast<IrOpcode::Value>(t.machine()->IntLessThan()->opcode());
+  IrOpcode::Value compare_le =
+      static_cast<IrOpcode::Value>(t.machine()->IntLessThanOrEqual()->opcode());
+  t.CheckLoweringBinop(compare_eq, t.simplified()->StringEqual());
+  t.CheckLoweringBinop(compare_lt, t.simplified()->StringLessThan());
+  t.CheckLoweringBinop(compare_le, t.simplified()->StringLessThanOrEqual());
   t.CheckLoweringBinop(IrOpcode::kCall, t.simplified()->StringAdd());
 }