[turbofan] Relax effects and context for JSToNumber(x:plain-primitive).

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 2c03d885c6b6c50657e7f09eaa9aa15692ad4a5f..d0c465fd34c4f04eab48e4eb65a1919593c46901 100644
--- a/test/unittests/compiler/js-typed-lowering-unittest.cc
+++ b/test/unittests/compiler/js-typed-lowering-unittest.cc
@@ -197,6 +197,23 @@ TEST_F(JSTypedLoweringTest, JSToBooleanWithSelect) {
 
 
 // -----------------------------------------------------------------------------
+// JSToNumber
+
+
+TEST_F(JSTypedLoweringTest, JSToNumberWithPlainPrimitive) {
+  Node* const input = Parameter(Type::PlainPrimitive(), 0);
+  Node* const context = Parameter(Type::Any(), 1);
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction r = Reduce(graph()->NewNode(javascript()->ToNumber(), input,
+                                        context, effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(r.replacement(), IsToNumber(input, IsNumberConstant(0),
+                                          graph()->start(), control));
+}
+
+
+// -----------------------------------------------------------------------------
 // JSStrictEqual