Improve FastCloneShallowArray/ObjectStubs with VFP copying on ARM

src/arm/macro-assembler-arm.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 723 matching lines @@
   void AllocateHeapNumberWithValue(Register result,
                                    DwVfpRegister value,
                                    Register scratch1,
                                    Register scratch2,
                                    Register heap_number_map,
                                    Label* gc_required);
 
   // Copies a fixed number of fields of heap objects from src to dst.
   void CopyFields(Register dst, Register src, RegList temps, int field_count);
 
+  // Copy a fixed number of fields of from src to dst using NEON.
+  // A contiguous range of VFP registers is specified to hold temporary values;
+  // providing more registers will result in smaller code size and lower
+  // execution time. Both dst and src must be word aligned (so no tagged
+  // pointers allowed). On completion, dst and src will point to the end of the
+  // copied regions.
+  void VFPCopyFields(Register dst, Register src, int field_count,
+                     SwVfpRegister first, SwVfpRegister last);
+
   // Copies a number of bytes from src to dst. All registers are clobbered. On
   // exit src and dst will point to the place just after where the last byte was
   // read or written and length will be zero.
   void CopyBytes(Register src,
                  Register dst,
                  Register length,
                  Register scratch);
 
   // Initialize fields with filler values.  Fields starting at |start_offset|
   // not including end_offset are overwritten with the value in |filler|.  At
@@ skipping 645 matching lines @@
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) masm->stop(__FILE_LINE__); masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_MACRO_ASSEMBLER_ARM_H_