Ensure consistency of Math.sqrt on Intel platforms.

src/codegen.h

 // Copyright 2011 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 69 matching lines @@
 #else
 #error Unsupported target architecture.
 #endif
 
 namespace v8 {
 namespace internal {
 
 // Results of the library implementation of transcendental functions may differ
 // from the one we use in our generated code.  Therefore we use the same
 // generated code both in runtime and compiled code.
-typedef double (*TranscendentalFunction)(double x);
+typedef double (*UnaryMathFunction)(double x);
 
-TranscendentalFunction CreateTranscendentalFunction(
-    TranscendentalCache::Type type);
+UnaryMathFunction CreateTranscendentalFunction(TranscendentalCache::Type type);
+UnaryMathFunction CreateSqrtFunction();
 
 
 class ElementsTransitionGenerator : public AllStatic {
  public:
   static void GenerateSmiOnlyToObject(MacroAssembler* masm);
   static void GenerateSmiOnlyToDouble(MacroAssembler* masm, Label* fail);
   static void GenerateDoubleToObject(MacroAssembler* masm, Label* fail);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ElementsTransitionGenerator);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODEGEN_H_