[turbofan] Refactor the InstructionSelector tests.

testing/gtest-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_GTEST_SUPPORT_H_
+#define V8_TESTING_GTEST_SUPPORT_H_
+
+#include "include/v8stdint.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace testing {
+namespace internal {
+
+#define GET_TYPE_NAME(type)                \
+  template <>                              \
+  inline std::string GetTypeName<type>() { \
+    return #type;                          \
+  }
+GET_TYPE_NAME(int8_t)
+GET_TYPE_NAME(uint8_t)
+GET_TYPE_NAME(int16_t)
+GET_TYPE_NAME(uint16_t)
+GET_TYPE_NAME(int32_t)
+GET_TYPE_NAME(uint32_t)
+GET_TYPE_NAME(int64_t)
+GET_TYPE_NAME(uint64_t)
+GET_TYPE_NAME(float)
+GET_TYPE_NAME(double)
+#undef GET_TYPE_NAME
+
+
+// TRACED_FOREACH(type, var, array) expands to a loop that assigns |var| every
+// item in the |array| and adds a SCOPED_TRACE() message for the |var| while
+// inside the loop body.
+// TODO(bmeurer): Migrate to C++11 once we're ready.
+#define TRACED_FOREACH(_type, _var, _array)                                \
+  for (size_t _i = 0; _i < ARRAY_SIZE(_array); ++_i)                       \
+    for (bool _done = false; !_done;)                                      \
+      for (const _type _var = _array[_i]; !_done;)                         \
+        for (SCOPED_TRACE(::testing::Message() << #_var << " = " << _var); \
+             !_done; _done = true)
+
+
+// TRACED_FORRANGE(type, var, low, high) expands to a loop that assigns |var|
+// every value in the range |low| to (including) |high| and adds a
+// SCOPED_TRACE() message for the |var| while inside the loop body.
+// TODO(bmeurer): Migrate to C++11 once we're ready.
+#define TRACED_FORRANGE(_type, _var, _low, _high)                          \
+  for (_type _i = _low; _i <= _high; ++_i)                                 \
+    for (bool _done = false; !_done;)                                      \
+      for (const _type _var = _i; !_done;)                                 \
+        for (SCOPED_TRACE(::testing::Message() << #_var << " = " << _var); \
+             !_done; _done = true)
+
+}  // namespace internal
+}  // namespace testing
+
+#endif  // V8_TESTING_GTEST_SUPPORT_H_