[Precision Depth Alignment] paddle.log aligns with torch precision (PaddlePaddle#75799)

* accuracy_stable_log

* accuracy_stable_log

* fix

* fix

* fix

* fix

* fix5

Author: zhengshengning

paddle/phi/kernels/funcs/activation_functor.h

@@ -5227,12 +5227,8 @@ __device__ __forceinline__
   static_assert(!std::is_same<T, double>::value,
                 "this template must be used with float or less precise type");
 
-#if defined(__CUDA_ARCH__) || defined(__HIP_ARCH__)
-  // use __logf fast approximation for peak bandwidth
-  return __logf(x);
-#else
-  return ::log(x);
-#endif
+  return static_cast<std::conditional_t<std::is_integral<T>::value, float, T>>(
+      ::log(static_cast<double>(x)));
 }
 
 template <>