[turbofan] Merge compiler unit tests into src.

src/compiler/change-lowering-unittest.cc

Index: src/compiler/change-lowering-unittest.cc
diff --git a/test/compiler-unittests/change-lowering-unittest.cc b/src/compiler/change-lowering-unittest.cc
similarity index 99%
rename from test/compiler-unittests/change-lowering-unittest.cc
rename to src/compiler/change-lowering-unittest.cc
index 4ea125a5f4cd20b51b01f1d30443f4dc64ca1bfb..dcdaf23aa7fec8ff8dc2ae621d2dedab0132fedb 100644
--- a/test/compiler-unittests/change-lowering-unittest.cc
+++ b/src/compiler/change-lowering-unittest.cc
@@ -3,11 +3,11 @@
 // found in the LICENSE file.
 
 #include "src/compiler/change-lowering.h"
+#include "src/compiler/graph-unittest.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties-inl.h"
 #include "src/compiler/simplified-operator.h"
 #include "src/compiler/typer.h"
-#include "test/compiler-unittests/graph-unittest.h"
 #include "testing/gmock-support.h"
 
 using testing::_;