[ARM] Improve VFP register moves.

src/arm/constants-arm.h

 // Copyright 2011 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_ARM_CONSTANTS_ARM_H_
 #define V8_ARM_CONSTANTS_ARM_H_
 
 #include <stdint.h>
 
 #include "src/base/logging.h"
@@ skipping 324 matching lines @@
   // Gap to make it easier to extract U and size.
   NeonU8 = 4,
   NeonU16 = 5,
   NeonU32 = 6
 };
 
 inline int NeonU(NeonDataType dt) { return static_cast<int>(dt) >> 2; }
 inline int NeonSz(NeonDataType dt) { return static_cast<int>(dt) & 0x3; }
 
 // Convert sizes to data types (U bit is clear).
-inline NeonDataType NeonSizeToDatatype(NeonSize size) {
+inline NeonDataType NeonSizeToDataType(NeonSize size) {
+  DCHECK_NE(Neon64, size);
   return static_cast<NeonDataType>(size);
 }
 
+inline NeonSize NeonDataTypeToSize(NeonDataType dt) {
+  return static_cast<NeonSize>(NeonSz(dt));
+}
+
 enum NeonListType {
   nlt_1 = 0x7,
   nlt_2 = 0xA,
   nlt_3 = 0x6,
   nlt_4 = 0x2
 };
 
 // -----------------------------------------------------------------------------
 // Supervisor Call (svc) specific support.
 
@@ skipping 365 matching lines @@
 
  private:
   static const char* names_[kNumVFPRegisters];
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARM_CONSTANTS_ARM_H_