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

src/code-stubs-hydrogen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/code-stubs.h"
 
 #include "src/bailout-reason.h"
 #include "src/crankshaft/hydrogen.h"
 #include "src/crankshaft/lithium.h"
 #include "src/field-index.h"
@@ skipping 1687 matching lines @@
 
 
 Handle<Code> StringAddStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 
 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();
 }
 
 
 Handle<Code> ToBooleanStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 
 template <>
 HValue* CodeStubGraphBuilder<StoreGlobalStub>::BuildCodeInitializedStub() {
@@ skipping 687 matching lines @@
   return Pop();
 }
 
 
 Handle<Code> KeyedLoadGenericStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 }  // namespace internal
 }  // namespace v8