[turbofan] Machine operators are globally shared singletons.

test/cctest/compiler/test-instruction.cc

Index: test/cctest/compiler/test-instruction.cc
diff --git a/test/cctest/compiler/test-instruction.cc b/test/cctest/compiler/test-instruction.cc
index e071d2371623458ecfbf30eee03d43427409b05a..08e44ece532ff66561479598b1f1792b7dfd0142 100644
--- a/test/cctest/compiler/test-instruction.cc
+++ b/test/cctest/compiler/test-instruction.cc
@@ -32,7 +32,6 @@ class InstructionTester : public HandleAndZoneScope {
         info(static_cast<HydrogenCodeStub*>(NULL), main_isolate()),
         linkage(&info),
         common(zone()),
-        machine(zone()),
         code(NULL) {}
 
   ~InstructionTester() { delete code; }