ARM: Use the vsqrt instruction when available...

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 970 matching lines @@
   void vdiv(const DwVfpRegister dst,
             const DwVfpRegister src1,
             const DwVfpRegister src2,
             const Condition cond = al);
   void vcmp(const DwVfpRegister src1,
             const DwVfpRegister src2,
             const SBit s = LeaveCC,
             const Condition cond = al);
   void vmrs(const Register dst,
             const Condition cond = al);
+  void vsqrt(const DwVfpRegister dst,
+             const DwVfpRegister src,
+             const Condition cond = al);
 
   // Pseudo instructions
   void nop(int type = 0);
 
   void push(Register src, Condition cond = al) {
     str(src, MemOperand(sp, 4, NegPreIndex), cond);
   }
 
   void pop(Register dst, Condition cond = al) {
     ldr(dst, MemOperand(sp, 4, PostIndex), cond);
@@ skipping 213 matching lines @@
 
   friend class RegExpMacroAssemblerARM;
   friend class RelocInfo;
   friend class CodePatcher;
   friend class BlockConstPoolScope;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_H_