[turbofan] Refactor the InstructionSelector tests.

test/cctest/compiler/test-instruction-selector.cc

Index: test/cctest/compiler/test-instruction-selector.cc
diff --git a/test/cctest/compiler/test-instruction-selector.cc b/test/cctest/compiler/test-instruction-selector.cc
deleted file mode 100644
index e59406426e8e9a189a86e61b06c04f8c982a6d7e..0000000000000000000000000000000000000000
--- a/test/cctest/compiler/test-instruction-selector.cc
+++ /dev/null
@@ -1,22 +0,0 @@
-// 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.
-
-#include "test/cctest/compiler/instruction-selector-tester.h"
-
-using namespace v8::internal;
-using namespace v8::internal::compiler;
-
-#if V8_TURBOFAN_TARGET
-
-TEST(InstructionSelectionReturnZero) {
-  InstructionSelectorTester m;
-  m.Return(m.Int32Constant(0));
-  m.SelectInstructions(InstructionSelectorTester::kInternalMode);
-  CHECK_EQ(2, static_cast<int>(m.code.size()));
-  CHECK_EQ(kArchNop, m.code[0]->opcode());
-  CHECK_EQ(kArchRet, m.code[1]->opcode());
-  CHECK_EQ(1, static_cast<int>(m.code[1]->InputCount()));
-}
-
-#endif  // !V8_TURBOFAN_TARGET