[turbofan] Merge compiler unit tests into src.

src/compiler/simplified-operator-reducer-unittest.cc

 // 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 "src/compiler/graph-unittest.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/simplified-operator.h"
 #include "src/compiler/simplified-operator-reducer.h"
 #include "src/compiler/typer.h"
 #include "src/conversions.h"
-#include "test/compiler-unittests/graph-unittest.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class SimplifiedOperatorReducerTest : public GraphTest {
  public:
   explicit SimplifiedOperatorReducerTest(int num_parameters = 1)
       : GraphTest(num_parameters), simplified_(zone()) {}
   virtual ~SimplifiedOperatorReducerTest() {}
@@ skipping 451 matching lines @@
         Reduce(graph()->NewNode(simplified()->ChangeUint32ToTagged(),
                                 Int32Constant(BitCast<int32_t>(n))));
     ASSERT_TRUE(reduction.Changed());
     EXPECT_THAT(reduction.replacement(), IsNumberConstant(FastUI2D(n)));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8