Implement UnaligedLoad and UnaligedStore turbofan operators.

src/machine-type.h

Index: src/machine-type.h
diff --git a/src/machine-type.h b/src/machine-type.h
index c72ead527b2d1d9595b89299328895377a7a13a5..f2c3e75f2de2a528925c2ad8be0b4e3b565e23cc 100644
--- a/src/machine-type.h
+++ b/src/machine-type.h
@@ -159,6 +159,35 @@ class MachineType {
     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_;