[turbofan] Handle impossible types (Type::None()) in the backend.

src/compiler/machine-operator.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/machine-operator.h"
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 
@@ skipping 117 matching lines @@
   V(RoundFloat64ToInt32, Operator::kNoProperties, 1, 0, 1)                   \
   V(RoundInt32ToFloat32, Operator::kNoProperties, 1, 0, 1)                   \
   V(RoundInt64ToFloat32, Operator::kNoProperties, 1, 0, 1)                   \
   V(RoundInt64ToFloat64, Operator::kNoProperties, 1, 0, 1)                   \
   V(RoundUint32ToFloat32, Operator::kNoProperties, 1, 0, 1)                  \
   V(RoundUint64ToFloat32, Operator::kNoProperties, 1, 0, 1)                  \
   V(RoundUint64ToFloat64, Operator::kNoProperties, 1, 0, 1)                  \
   V(ChangeInt32ToInt64, Operator::kNoProperties, 1, 0, 1)                    \
   V(ChangeUint32ToFloat64, Operator::kNoProperties, 1, 0, 1)                 \
   V(ChangeUint32ToUint64, Operator::kNoProperties, 1, 0, 1)                  \
+  V(ImpossibleToWord32, Operator::kNoProperties, 1, 0, 1)                    \
+  V(ImpossibleToWord64, Operator::kNoProperties, 1, 0, 1)                    \
+  V(ImpossibleToFloat32, Operator::kNoProperties, 1, 0, 1)                   \
+  V(ImpossibleToFloat64, Operator::kNoProperties, 1, 0, 1)                   \
+  V(ImpossibleToTagged, Operator::kNoProperties, 1, 0, 1)                    \
+  V(ImpossibleToBit, Operator::kNoProperties, 1, 0, 1)                       \
   V(TruncateFloat64ToFloat32, Operator::kNoProperties, 1, 0, 1)              \
   V(TruncateInt64ToInt32, Operator::kNoProperties, 1, 0, 1)                  \
   V(BitcastFloat32ToInt32, Operator::kNoProperties, 1, 0, 1)                 \
   V(BitcastFloat64ToInt64, Operator::kNoProperties, 1, 0, 1)                 \
   V(BitcastInt32ToFloat32, Operator::kNoProperties, 1, 0, 1)                 \
   V(BitcastInt64ToFloat64, Operator::kNoProperties, 1, 0, 1)                 \
   V(Float32Abs, Operator::kNoProperties, 1, 0, 1)                            \
   V(Float32Add, Operator::kCommutative, 2, 0, 1)                             \
   V(Float32Sub, Operator::kNoProperties, 2, 0, 1)                            \
   V(Float32SubPreserveNan, Operator::kNoProperties, 2, 0, 1)                 \
@@ skipping 573 matching lines @@
   }
   ATOMIC_REPRESENTATION_LIST(STORE)
 #undef STORE
   UNREACHABLE();
   return nullptr;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8