Implement UnaligedLoad and UnaligedStore turbofan operators.

src/machine-type.h

 // 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.
 
 #ifndef V8_MACHINE_TYPE_H_
 #define V8_MACHINE_TYPE_H_
 
 #include <iosfwd>
 
 #include "src/base/bits.h"
@@ skipping 141 matching lines @@
   static MachineType RepSimd128() {
     return MachineType(MachineRepresentation::kSimd128, MachineSemantic::kNone);
   }
   static MachineType RepTagged() {
     return MachineType(MachineRepresentation::kTagged, MachineSemantic::kNone);
   }
   static MachineType RepBit() {
     return MachineType(MachineRepresentation::kBit, MachineSemantic::kNone);
   }
 
+  static MachineType TypeForRepresentation(MachineRepresentation& rep,
+                                           bool isSigned = true) {
+    switch (rep) {
+      case MachineRepresentation::kNone:
+        return MachineType::None();
+      case MachineRepresentation::kBit:
+        return MachineType::Bool();
+      case MachineRepresentation::kWord8:
+        return isSigned ? MachineType::Int8() : MachineType::Uint8();
+      case MachineRepresentation::kWord16:
+        return isSigned ? MachineType::Int16() : MachineType::Uint16();
+      case MachineRepresentation::kWord32:
+        return isSigned ? MachineType::Int32() : MachineType::Uint32();
+      case MachineRepresentation::kWord64:
+        return isSigned ? MachineType::Int64() : MachineType::Uint64();
+      case MachineRepresentation::kFloat32:
+        return MachineType::Float32();
+      case MachineRepresentation::kFloat64:
+        return MachineType::Float64();
+      case MachineRepresentation::kSimd128:
+        return MachineType::Simd128();
+      case MachineRepresentation::kTagged:
+        return MachineType::AnyTagged();
+      default:
+        UNREACHABLE();
+        return MachineType::None();
+    }
+  }
+
  private:
   MachineRepresentation representation_;
   MachineSemantic semantic_;
 };
 
 V8_INLINE size_t hash_value(MachineRepresentation rep) {
   return static_cast<size_t>(rep);
 }
 
 V8_INLINE size_t hash_value(MachineType type) {
@@ skipping 35 matching lines @@
   UNREACHABLE();
   return -1;
 }
 
 typedef Signature<MachineType> MachineSignature;
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MACHINE_TYPE_H_