[turbofan] Add Float32(Max|Min) machine operators.

test/cctest/compiler/value-helper.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_CCTEST_COMPILER_VALUE_HELPER_H_
 #define V8_CCTEST_COMPILER_VALUE_HELPER_H_
 
 #include <stdint.h>
 
 #include "src/compiler/common-operator.h"
@@ skipping 314 matching lines @@
 #define FOR_INT32_SHIFTS(var) for (int32_t var = 0; var < 32; var++)
 
 #define FOR_UINT32_SHIFTS(var) for (uint32_t var = 0; var < 32; var++)
 
 // TODO(bmeurer): Drop this crap once we switch to GTest/Gmock.
 static inline void CheckFloatEq(volatile float x, volatile float y) {
   if (std::isnan(x)) {
     CHECK(std::isnan(y));
   } else {
     CHECK_EQ(x, y);
+    CHECK_EQ(std::signbit(x), std::signbit(y));
   }
 }
 
 #define CHECK_FLOAT_EQ(lhs, rhs) \
   do {                           \
     volatile float tmp = lhs;    \
     CheckFloatEq(tmp, rhs);      \
   } while (0)
 
 static inline void CheckDoubleEq(volatile double x, volatile double y) {
   if (std::isnan(x)) {
     CHECK(std::isnan(y));
   } else {
     CHECK_EQ(x, y);
+    CHECK_EQ(std::signbit(x), std::signbit(y));
   }
 }
 
 #define CHECK_DOUBLE_EQ(lhs, rhs) \
   do {                            \
     volatile double tmp = lhs;    \
     CheckDoubleEq(tmp, rhs);      \
   } while (0)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CCTEST_COMPILER_VALUE_HELPER_H_