PPC/s390: [builtins] Introduce proper Float64Exp operator.

src/ppc/codegen-ppc.h

Index: src/ppc/codegen-ppc.h
diff --git a/src/ppc/codegen-ppc.h b/src/ppc/codegen-ppc.h
index c3cd9b39a0e52a6a30fa5194c0d279728d395238..ff487c3ce1585d16e6a97da18b663428d9be8eab 100644
--- a/src/ppc/codegen-ppc.h
+++ b/src/ppc/codegen-ppc.h
@@ -23,18 +23,6 @@ class StringCharLoadGenerator : public AllStatic {
  private:
   DISALLOW_COPY_AND_ASSIGN(StringCharLoadGenerator);
 };
-
-class MathExpGenerator : public AllStatic {
- public:
-  // Register input isn't modified. All other registers are clobbered.
-  static void EmitMathExp(MacroAssembler* masm, DoubleRegister input,
-                          DoubleRegister result, DoubleRegister double_scratch1,
-                          DoubleRegister double_scratch2, Register temp1,
-                          Register temp2, Register temp3);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(MathExpGenerator);
-};
 }  // namespace internal
 }  // namespace v8