[turbofan] Desugar JSUnaryNot(x) to Select(x, false, true).

src/code-stubs-hydrogen.cc

Index: src/code-stubs-hydrogen.cc
diff --git a/src/code-stubs-hydrogen.cc b/src/code-stubs-hydrogen.cc
index 62ba43f578b9b8ab84c2e0b5e8f4fde9bd0fa9ea..793034c1e2232b4b364c4ee16f86c56fd5903084 100644
--- a/src/code-stubs-hydrogen.cc
+++ b/src/code-stubs-hydrogen.cc
@@ -1705,31 +1705,13 @@ Handle<Code> StringAddStub::GenerateCode() {
 template <>
 HValue* CodeStubGraphBuilder<ToBooleanStub>::BuildCodeInitializedStub() {
   ToBooleanStub* stub = casted_stub();
-  HValue* true_value = NULL;
-  HValue* false_value = NULL;
-
-  switch (stub->mode()) {
-    case ToBooleanStub::RESULT_AS_SMI:
-      true_value = graph()->GetConstant1();
-      false_value = graph()->GetConstant0();
-      break;
-    case ToBooleanStub::RESULT_AS_ODDBALL:
-      true_value = graph()->GetConstantTrue();
-      false_value = graph()->GetConstantFalse();
-      break;
-    case ToBooleanStub::RESULT_AS_INVERSE_ODDBALL:
-      true_value = graph()->GetConstantFalse();
-      false_value = graph()->GetConstantTrue();
-      break;
-  }
-
   IfBuilder if_true(this);
   if_true.If<HBranch>(GetParameter(0), stub->types());
   if_true.Then();
-  if_true.Return(true_value);
+  if_true.Return(graph()->GetConstantTrue());
   if_true.Else();
   if_true.End();
-  return false_value;
+  return graph()->GetConstantFalse();
 }