[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 <cstring>
 
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace testing {
 
 template <typename T>
 class Capture {
  public:
   Capture() : value_(), has_value_(false) {}
@@ skipping 71 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>
 inline Matcher<T> CaptureEq(Capture<T>* capture) {
   return MakeMatcher(new internal::CaptureEqMatcher<T>(capture));
 }
 
+
+// Creates a polymorphic matcher that matches any floating point NaN value.
+MATCHER(IsNaN, std::string(negation ? "isn't" : "is") + " not a number") {
+  return std::isnan(arg);
+}
+
 }  // namespace testing
 
 #endif  // V8_TESTING_GMOCK_SUPPORT_H_