[turbofan] Make MachineType a pair of enums.

src/compiler/simplified-operator.cc

 // Copyright 2012 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/simplified-operator.h"
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 #include "src/types-inl.h"
@@ skipping 11 matching lines @@
   }
   UNREACHABLE();
   return os;
 }
 
 
 MachineType BufferAccess::machine_type() const {
   switch (external_array_type_) {
     case kExternalUint8Array:
     case kExternalUint8ClampedArray:
-      return kMachUint8;
+      return MachineType::Uint8();
     case kExternalInt8Array:
-      return kMachInt8;
+      return MachineType::Int8();
     case kExternalUint16Array:
-      return kMachUint16;
+      return MachineType::Uint16();
     case kExternalInt16Array:
-      return kMachInt16;
+      return MachineType::Int16();
     case kExternalUint32Array:
-      return kMachUint32;
+      return MachineType::Uint32();
     case kExternalInt32Array:
-      return kMachInt32;
+      return MachineType::Int32();
     case kExternalFloat32Array:
-      return kMachFloat32;
+      return MachineType::Float32();
     case kExternalFloat64Array:
-      return kMachFloat64;
+      return MachineType::Float64();
   }
   UNREACHABLE();
-  return kMachNone;
+  return MachineType::None();
 }
 
 
 bool operator==(BufferAccess lhs, BufferAccess rhs) {
   return lhs.external_array_type() == rhs.external_array_type();
 }
 
 
 bool operator!=(BufferAccess lhs, BufferAccess rhs) { return !(lhs == rhs); }
 
@@ skipping 247 matching lines @@
         Operator1<Type>(IrOpcode::k##Name, Operator::kNoThrow | properties,    \
                         #Name, value_input_count, 1, control_input_count,      \
                         output_count, 1, 0, access);                           \
   }
 ACCESS_OP_LIST(ACCESS)
 #undef ACCESS
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8