[turbofan] Optimize ToName conversion.

test/unittests/compiler/js-typed-lowering-unittest.cc

Index: test/unittests/compiler/js-typed-lowering-unittest.cc
diff --git a/test/unittests/compiler/js-typed-lowering-unittest.cc b/test/unittests/compiler/js-typed-lowering-unittest.cc
index 0b9935081bd99f87b2530130d572fc297453aa35..bded0c9fd82b59b2644fbf1e875266ebdf4cbad6 100644
--- a/test/unittests/compiler/js-typed-lowering-unittest.cc
+++ b/test/unittests/compiler/js-typed-lowering-unittest.cc
@@ -126,8 +126,42 @@ TEST_F(JSTypedLoweringTest, JSToBooleanWithAny) {
 
 
 // -----------------------------------------------------------------------------
-// JSToNumber
+// JSToName
+
+TEST_F(JSTypedLoweringTest, JSToNameWithString) {
+  Node* const input = Parameter(Type::String(), 0);
+  Node* const context = Parameter(Type::Any(), 1);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction r = Reduce(graph()->NewNode(javascript()->ToName(), input, context,
+                                        EmptyFrameState(), effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_EQ(input, r.replacement());
+}
 
+TEST_F(JSTypedLoweringTest, JSToNameWithSymbol) {
+  Node* const input = Parameter(Type::Symbol(), 0);
+  Node* const context = Parameter(Type::Any(), 1);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction r = Reduce(graph()->NewNode(javascript()->ToName(), input, context,
+                                        EmptyFrameState(), effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_EQ(input, r.replacement());
+}
+
+TEST_F(JSTypedLoweringTest, JSToNameWithAny) {
+  Node* const input = Parameter(Type::Any(), 0);
+  Node* const context = Parameter(Type::Any(), 1);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction r = Reduce(graph()->NewNode(javascript()->ToName(), input, context,
+                                        EmptyFrameState(), effect, control));
+  ASSERT_FALSE(r.Changed());
+}
+
+// -----------------------------------------------------------------------------
+// JSToNumber
 
 TEST_F(JSTypedLoweringTest, JSToNumberWithPlainPrimitive) {
   Node* const input = Parameter(Type::PlainPrimitive(), 0);