Move MachineRepresentation to machine-type.h and rename to MachineType in preparation for merging i…

src/compiler/machine-type.h

Index: src/compiler/machine-type.h
diff --git a/src/compiler/machine-type.h b/src/compiler/machine-type.h
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+++ b/src/compiler/machine-type.h
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+// 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_COMPILER_MACHINE_TYPE_H_
+#define V8_COMPILER_MACHINE_TYPE_H_
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+// An enumeration of the storage representations at the machine level.
+// - Words are uninterpreted bits of a given fixed size that can be used
+//   to store integers and pointers. They are normally allocated to general
+//   purpose registers by the backend and are not tracked for GC.
+// - Floats are bits of a given fixed size that are used to store floating
+//   point numbers. They are normally allocated to the floating point
+//   registers of the machine and are not tracked for the GC.
+// - Tagged values are the size of a reference into the heap and can store
+//   small words or references into the heap using a language and potentially
+//   machine-dependent tagging scheme. These values are tracked by the code
+//   generator for precise GC.
+enum MachineType {
+  kMachineWord8,
+  kMachineWord16,
+  kMachineWord32,
+  kMachineWord64,
+  kMachineFloat64,
+  kMachineTagged,
+  kMachineLast
+};
+}
+}
+}  // namespace v8::internal::compiler
+
+#endif  // V8_COMPILER_MACHINE_TYPE_H_