Revert of [builtins] Introduce proper Float64Exp operator.

src/x64/codegen-x64.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_X64_CODEGEN_X64_H_
 #define V8_X64_CODEGEN_X64_H_
 
 #include "src/ast/ast.h"
 #include "src/macro-assembler.h"
 
@@ skipping 10 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);
+};
+
+
 enum StackArgumentsAccessorReceiverMode {
   ARGUMENTS_CONTAIN_RECEIVER,
   ARGUMENTS_DONT_CONTAIN_RECEIVER
 };
 
 
 class StackArgumentsAccessor BASE_EMBEDDED {
  public:
   StackArgumentsAccessor(
       Register base_reg,
@@ skipping 50 matching lines @@
   const int extra_displacement_to_last_argument_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(StackArgumentsAccessor);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_X64_CODEGEN_X64_H_