Revert of [builtins] Introduce proper Float64Exp operator.

src/ia32/codegen-ia32.h

Index: src/ia32/codegen-ia32.h
diff --git a/src/ia32/codegen-ia32.h b/src/ia32/codegen-ia32.h
index 46468e9aa5e0b185451aaae1e9759b86234d748c..133b1adbdf36553d9c9fa6fc63a3c7296a7edf24 100644
--- a/src/ia32/codegen-ia32.h
+++ b/src/ia32/codegen-ia32.h
@@ -29,6 +29,19 @@
 };
 
 
+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