[turbofan] Improve code generation for inline comparisons with zero.

src/compiler/typer.cc

 // Copyright 2014 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/bootstrapper.h"
 #include "src/compiler/graph-inl.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/node.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/compiler/node-properties.h"
@@ skipping 1026 matching lines @@
 
 // Simplified operators.
 
 
 Bounds Typer::Visitor::TypeBooleanNot(Node* node) {
   return Bounds(Type::None(zone()), Type::Boolean(zone()));
 }
 
 
 Bounds Typer::Visitor::TypeBooleanToNumber(Node* node) {
-  return Bounds(Type::None(zone()), Type::Number(zone()));
+  return Bounds(Type::None(zone()), typer_->zero_or_one);
 }
 
 
 Bounds Typer::Visitor::TypeNumberEqual(Node* node) {
   return Bounds(Type::None(zone()), Type::Boolean(zone()));
 }
 
 
 Bounds Typer::Visitor::TypeNumberLessThan(Node* node) {
   return Bounds(Type::None(zone()), Type::Boolean(zone()));
@@ skipping 577 matching lines @@
         return typer_->float64_array_fun_;
       }
     }
   }
   return Type::Constant(value, zone());
 }
 
 }
 }
 }  // namespace v8::internal::compiler