[turbofan] Improve testability of the InstructionSelector.

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
index 862643f0c8f4b42dbc42a214b6abbf1134df0308..4cab8758a13ca2155e113cb1be3acfd3e590867b 100644
--- a/test/cctest/compiler/test-instruction-selector.cc
+++ b/test/cctest/compiler/test-instruction-selector.cc
@@ -7,16 +7,16 @@
 using namespace v8::internal;
 using namespace v8::internal::compiler;
 
-#if V8_TURBOFAN_TARGET
+#if V8_TURBOFAN_BACKEND
 
 TEST(InstructionSelectionReturnZero) {
-  InstructionSelectorTester m(InstructionSelectorTester::kInternalMode);
+  InstructionSelectorTester m;
   m.Return(m.Int32Constant(0));
-  m.SelectInstructions();
+  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
+#endif  // !V8_TURBOFAN_BACKEND