[builtins] Introduce proper Float64Exp operator.

src/arm/codegen-arm.h

Index: src/arm/codegen-arm.h
diff --git a/src/arm/codegen-arm.h b/src/arm/codegen-arm.h
index 880825a1be0e4fc21df3117064cedf3964754c98..00867392ed2758c57ce40742dd11bdebe38144a1 100644
--- a/src/arm/codegen-arm.h
+++ b/src/arm/codegen-arm.h
@@ -28,22 +28,6 @@ class StringCharLoadGenerator : public AllStatic {
 };
 
 
-class MathExpGenerator : public AllStatic {
- public:
-  // Register input isn't modified. All other registers are clobbered.
-  static void EmitMathExp(MacroAssembler* masm,
-                          DwVfpRegister input,
-                          DwVfpRegister result,
-                          DwVfpRegister double_scratch1,
-                          DwVfpRegister double_scratch2,
-                          Register temp1,
-                          Register temp2,
-                          Register temp3);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(MathExpGenerator);
-};
-
 }  // namespace internal
 }  // namespace v8