[builtins] Introduce proper Float64Exp operator.

src/mips/codegen-mips.h

Index: src/mips/codegen-mips.h
diff --git a/src/mips/codegen-mips.h b/src/mips/codegen-mips.h
index ad7abb30c559153336f9739ba96c88ad69e168cd..a4f818425a9ec67b0b1d1a2764a2e3a74a1314eb 100644
--- a/src/mips/codegen-mips.h
+++ b/src/mips/codegen-mips.h
@@ -29,23 +29,6 @@ class StringCharLoadGenerator : public AllStatic {
   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