[turbofan] Generalize constant propagation.

testing/gmock-support.h

 // 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.
 
 #ifndef V8_TESTING_GMOCK_SUPPORT_H_
 #define V8_TESTING_GMOCK_SUPPORT_H_
 
+#include <cmath>
+
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace testing {
 
 template <typename T>
 class Capture {
  public:
   Capture() : value_(), has_value_(false) {}
 
   const T& value() const { return value_; }
   bool has_value() const { return has_value_; }
 
   void SetValue(const T& value) {
     DCHECK(!has_value());
     value_ = value;
     has_value_ = true;
   }
 
  private:
   T value_;
   bool has_value_;
 };
 
 
+MATCHER(IsNaN, std::string(negation ? "isn't" : "is") + " NaN") {
+  return std::isnan(arg);
+}
+
+
 namespace internal {
 
 template <typename T>
 class CaptureEqMatcher : public MatcherInterface<T> {
  public:
   explicit CaptureEqMatcher(Capture<T>* capture) : capture_(capture) {}
 
   virtual void DescribeTo(std::ostream* os) const {
     *os << "captured by " << static_cast<const void*>(capture_);
     if (capture_->has_value()) *os << " which has value " << capture_->value();
@@ skipping 21 matching lines @@
 // CaptureEq(capture) captures the value passed in during matching as long as it
 // is unset, and once set, compares the value for equality with the argument.
 template <typename T>
 Matcher<T> CaptureEq(Capture<T>* capture) {
   return MakeMatcher(new internal::CaptureEqMatcher<T>(capture));
 }
 
 }  // namespace testing
 
 #endif  // V8_TESTING_GMOCK_SUPPORT_H_