[turbofan] Introduce TruncateTaggedToBit operator for ToBoolean truncation.

test/unittests/compiler/simplified-operator-unittest.cc

Index: test/unittests/compiler/simplified-operator-unittest.cc
diff --git a/test/unittests/compiler/simplified-operator-unittest.cc b/test/unittests/compiler/simplified-operator-unittest.cc
index 23d42c778f0282e9d09ca149d6e3ccd72a0b5525..d32dcaec1208092553b176abcf09d0a63938e91e 100644
--- a/test/unittests/compiler/simplified-operator-unittest.cc
+++ b/test/unittests/compiler/simplified-operator-unittest.cc
@@ -63,6 +63,8 @@ const PureOperator kPureOperators[] = {
     PURE(ChangeTaggedToBit, Operator::kNoProperties, 1),
     PURE(ChangeBitToTagged, Operator::kNoProperties, 1),
     PURE(TruncateTaggedToWord32, Operator::kNoProperties, 1),
+    PURE(TruncateTaggedToFloat64, Operator::kNoProperties, 1),
+    PURE(TruncateTaggedToBit, Operator::kNoProperties, 1),
     PURE(ObjectIsNumber, Operator::kNoProperties, 1),
     PURE(ObjectIsReceiver, Operator::kNoProperties, 1),
     PURE(ObjectIsSmi, Operator::kNoProperties, 1)