Reverts refactoring of CPU feature detection for

runtime/vm/assembler_arm.h

Index: runtime/vm/assembler_arm.h
===================================================================
--- runtime/vm/assembler_arm.h	(revision 32559)
+++ runtime/vm/assembler_arm.h	(working copy)
@@ -63,6 +63,26 @@
   DISALLOW_COPY_AND_ASSIGN(Label);
 };
 
+
+class CPUFeatures : public AllStatic {
+ public:
+  static void InitOnce();
+  static bool double_truncate_round_supported() { return false; }
+  static bool integer_division_supported();
+  static bool neon_supported();
+#if defined(USING_SIMULATOR)
+  static void set_integer_division_supported(bool supported);
+  static void set_neon_supported(bool supported);
+#endif
+ private:
+  static bool integer_division_supported_;
+  static bool neon_supported_;
+#if defined(DEBUG)
+  static bool initialized_;
+#endif
+};
+
+
 // Encodes Addressing Mode 1 - Data-processing operands.
 class ShifterOperand : public ValueObject {
  public: