[builtins] Introduce proper Float64Exp operator.

src/ia32/codegen-ia32.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_IA32_CODEGEN_IA32_H_
 #define V8_IA32_CODEGEN_IA32_H_
 
 #include "src/ast/ast.h"
 #include "src/macro-assembler.h"
 
@@ skipping 11 matching lines @@
                        Register string,
                        Register index,
                        Register result,
                        Label* call_runtime);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(StringCharLoadGenerator);
 };
 
 
-class MathExpGenerator : public AllStatic {
- public:
-  static void EmitMathExp(MacroAssembler* masm,
-                          XMMRegister input,
-                          XMMRegister result,
-                          XMMRegister double_scratch,
-                          Register temp1,
-                          Register temp2);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(MathExpGenerator);
-};
-
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_IA32_CODEGEN_IA32_H_