Fix llm int8 build error (#55338)

* add macro to avoid llm.int8 build error

* fix ci

---------
Co-authored-by: Nwufeisheng <wfs1997@163.com>

paddle/phi/kernels/impl/llm_int8_matmul_kernel_impl.h

@@ -225,6 +225,7 @@ __global__ void ReduceAbsMaxKernel(const T* x,
                                    const int32_t cols,
                                    float* row_ranges,
                                    int32_t* outlier_idx) {
+#if CUDA_ARCH_FP16_SUPPORTED(__CUDA_ARCH__)
   using InVec = phi::AlignedVector<T, VecSize>;
   using ComputeVec = phi::AlignedVector<ComputeType, VecSize>;
 
@@ -263,6 +264,7 @@ __global__ void ReduceAbsMaxKernel(const T* x,
       row_ranges[row_idx] = tmp_max_val;
     }
   }
+#endif
 }
 
 template <typename T, int VecSize>
@@ -300,21 +302,6 @@ __global__ void QuantActKernel(const T* x,
   }
 }
 
-template <typename T, int VecSize>
-__global__ void Fill(T* input, T value, int64_t num) {
-  phi::AlignedVector<T, VecSize> in_vec;
-  int stride = blockDim.x * gridDim.x * VecSize;
-  int base_idx = (blockIdx.x * blockDim.x + threadIdx.x) * VecSize;
-
-  for (int idx = base_idx; idx < num; idx += stride) {
-#pragma unroll
-    for (int j = 0; j < VecSize; ++j) {
-      in_vec[j] = value;
-    }
-    phi::Store(in_vec, input + idx);
-  }
-}
-
 template <typename T>
 __global__ void SplitKernel(const T* x,
                             const int8_t* weight,
@@ -433,6 +420,7 @@ __global__ void DequantMergeKernel(const int32_t* x,
                                    T* y,
                                    int m,
                                    int n) {
+#if CUDA_ARCH_FP16_SUPPORTED(__CUDA_ARCH__)
   using FpVec = phi::AlignedVector<T, VecSize>;
   using IntVec = phi::AlignedVector<int32_t, VecSize>;
 
@@ -455,18 +443,7 @@ __global__ void DequantMergeKernel(const int32_t* x,
       phi::Store(out_vec, y + linear_idx);
     }
   }
-}
-
-template <typename T>
-void LaunchFillKernel(T* input,
-                      T value,
-                      int64_t num,
-                      backends::gpu::GpuLaunchConfig* gpu_config,
-                      gpuStream_t stream) {
-  constexpr int VecSize = 16 / sizeof(T);
-  Fill<T, VecSize>
-      <<<gpu_config->block_per_grid, gpu_config->thread_per_block, 0, stream>>>(
-          input, value, num);
+#endif
 }
 
 template <typename T>