[turbofan] Merge compiler unit tests into src.

src/compiler/graph-unittest.cc

Index: src/compiler/graph-unittest.cc
diff --git a/test/compiler-unittests/graph-unittest.cc b/src/compiler/graph-unittest.cc
similarity index 99%
rename from test/compiler-unittests/graph-unittest.cc
rename to src/compiler/graph-unittest.cc
index 5e125b95914b11a225d694d590f62840863c85cf..25c8da5b5c39e69be456147a8c9d652c6cd089af 100644
--- a/test/compiler-unittests/graph-unittest.cc
+++ b/src/compiler/graph-unittest.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "test/compiler-unittests/graph-unittest.h"
+#include "src/compiler/graph-unittest.h"
 
 #include <ostream>  // NOLINT(readability/streams)
 
@@ -32,7 +32,7 @@ inline std::ostream& operator<<(std::ostream& os,
 
 namespace compiler {
 
-GraphTest::GraphTest(int num_parameters) : graph_(zone()) {
+GraphTest::GraphTest(int num_parameters) : common_(zone()), graph_(zone()) {
   graph()->SetStart(graph()->NewNode(common()->Start(num_parameters)));
 }