[turbofan] Merge compiler unit tests into src.

src/compiler/compiler-unittests.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_COMPILER_UNITTESTS_COMPILER_UNITTESTS_H_
 #define V8_COMPILER_UNITTESTS_COMPILER_UNITTESTS_H_
 
 #include "include/v8.h"
 #include "src/zone.h"
 #include "testing/gtest-support.h"
 
 namespace v8 {
 namespace internal {
+
+// Forward declarations.
+class Factory;
+
+
 namespace compiler {
 
 // The TARGET_TEST(Case, Name) macro works just like
 // TEST(Case, Name), except that the test is disabled
 // if the platform is not a supported TurboFan target.
 #if V8_TURBOFAN_TARGET
 #define TARGET_TEST(Case, Name) TEST(Case, Name)
 #else
 #define TARGET_TEST(Case, Name) TEST(Case, DISABLED_##Name)
 #endif
@@ skipping 52 matching lines @@
 
 template <typename T>
 class CompilerTestWithParam : public CompilerTest,
                               public ::testing::WithParamInterface<T> {};
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_UNITTESTS_COMPILER_UNITTESTS_H_