Improve FastCloneShallowArray/ObjectStubs with VFP copying on ARM

src/arm/assembler-arm.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 156 matching lines @@
 
 
 // Single word VFP register.
 struct SwVfpRegister {
   bool is_valid() const { return 0 <= code_ && code_ < 32; }
   bool is(SwVfpRegister reg) const { return code_ == reg.code_; }
   int code() const {
     ASSERT(is_valid());
     return code_;
   }
+  static SwVfpRegister from_code(int code) {
+    SwVfpRegister r = { code };
+    return r;
+  }
   int bit() const {
     ASSERT(is_valid());
     return 1 << code_;
   }
   void split_code(int* vm, int* m) const {
     ASSERT(is_valid());
     *m = code_ & 0x1;
     *vm = code_ >> 1;
   }
 
@@ skipping 1280 matching lines @@
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_H_