[turbofan] Fix incorrect minus zero handling in the unit tests.

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 <cstring>
+
 #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_;
 };
 
 
 namespace internal {
 
+struct AnyBitEq {
+  template <typename A, typename B>
+  bool operator()(A const& a, B const& b) const {
+    if (sizeof(A) != sizeof(B)) return false;
+    return std::memcmp(&a, &b, sizeof(A)) == 0;
+  }
+};
+
+
+template <typename Rhs>
+class BitEqMatcher : public ComparisonBase<BitEqMatcher<Rhs>, Rhs, AnyBitEq> {
+ public:
+  explicit BitEqMatcher(Rhs const& rhs)
+      : ComparisonBase<BitEqMatcher<Rhs>, Rhs, AnyBitEq>(rhs) {}
+  static const char* Desc() { return "is bitwise equal to"; }
+  static const char* NegatedDesc() { return "isn't bitwise equal to"; }
+};
+
+
 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();
   }
 
   virtual bool MatchAndExplain(T value, MatchResultListener* listener) const {
     if (!capture_->has_value()) {
       capture_->SetValue(value);
       return true;
     }
     if (value != capture_->value()) {
       *listener << "which is not equal to " << capture_->value();
       return false;
     }
     return true;
   }
 
  private:
   Capture<T>* capture_;
 };
 
 }  // namespace internal
 
 
+// Creates a polymorphic matcher that matches anything whose bit representation
+// is equal to that of x.
+template <typename T>
+inline internal::BitEqMatcher<T> BitEq(T const& x) {
+  return internal::BitEqMatcher<T>(x);
+}
+
+
 // 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) {
+inline Matcher<T> CaptureEq(Capture<T>* capture) {
   return MakeMatcher(new internal::CaptureEqMatcher<T>(capture));
 }
 
 }  // namespace testing
 
 #endif  // V8_TESTING_GMOCK_SUPPORT_H_