Reverts refactoring of CPU feature detection for

runtime/vm/cpuinfo.h

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-#ifndef VM_CPUINFO_H_
-#define VM_CPUINFO_H_
-
-#include "platform/assert.h"
-#include "vm/allocation.h"
-
-namespace dart {
-
-class CpuInfo : public AllStatic {
- public:
-  // Indices into cpuinfo field name arrays.
-  enum CpuInfoIndices {
-    kCpuInfoProcessor = 0,
-    kCpuInfoModel = 1,
-    kCpuInfoFeatures = 2,
-    kCpuInfoMax = 3,
-  };
-
-  // If necessary, allocates a buffer [data_] and reads cpuinfo into
-  // that buffer.
-  static void InitOnce();
-
-  static const char* FieldName(CpuInfoIndices idx) {
-    ASSERT((idx >= 0) && (idx < kCpuInfoMax));
-    return fields_[idx];
-  }
-
-  // Returns true if the cpuinfo field [field] contains the
-  // string [search_string].
-  static bool FieldContains(const char* field, const char* search_string);
-  static bool FieldContainsById(CpuInfoIndices idx, const char* search_string) {
-    return FieldContains(FieldName(idx), search_string);
-  }
-
-  // Returns true if the cpuinfo field [field] exists and is non-empty.
-  static bool HasField(const char* field);
-
-  // Reads the cpuinfo field [field] into the buffer [dest] and returns the
-  // length of the field.
-  // If [dest] is NULL, ExtractField just returns the length.
-  static char* ExtractField(const char* field);
-
-  // Reads the cpuinfo field describing the CPU model into the buffer [dest].
-  static char* GetCpuModel() {
-    ASSERT(HasField(FieldName(kCpuInfoModel)));
-    return ExtractField(FieldName(kCpuInfoModel));
-  }
-
- private:
-  // On Linux and Android data_ holds /proc/cpuinfo after Read().
-  static char* data_;
-
-  // On Linux and Android, the length of /proc/cpuinfo.
-  static intptr_t datalen_;
-
-  // Fills in the fields_ array.
-  static void InitializeFields();
-
-  // Cpuinfo field names.
-  static const char* fields_[kCpuInfoMax];
-};
-
-}  // namespace dart
-
-#endif  // VM_CPUINFO_H_