fix gcc12 error of coverage_ci (#54009)

paddle/phi/core/device_context.cc

@@ -297,6 +297,7 @@ struct DeviceContext::Impl {
 DeviceContext::DeviceContext() { impl_ = std::make_unique<Impl>(); }
 
 DeviceContext::DeviceContext(const DeviceContext& other) {
+  impl_ = std::make_unique<Impl>();
   impl_->SetHostAllocator(&other.GetHostAllocator());
   impl_->SetAllocator(&other.GetAllocator());
   impl_->SetZeroAllocator(&other.GetZeroAllocator());

paddle/phi/core/utils/array.h

@@ -85,7 +85,7 @@ class Array {
     return ptr + i;
   }
 
-  T data_[N];
+  T data_[N] = {};
 };
 
 template <typename T>

paddle/phi/kernels/funcs/detail/gru_cpu_kernel.h

@@ -130,7 +130,7 @@ void hl_avx_gru_forward_reset_output(OpResetOutput op_reset_output,
 #ifdef __AVX__
   __m256 r_value_update_gate, r_value_update_gate_last = _mm256_set1_ps(0.0f);
   __m256 r_value_reset_gate, r_value_reset_gate_last = _mm256_set1_ps(0.0f);
-  __m256 r_value_reset_output;
+  __m256 r_value_reset_output = _mm256_setzero_ps();
   __m256 r_prev_out = _mm256_set1_ps(0.0f),
          r_prev_out_last = _mm256_set1_ps(0.0f);
   __m256 r_reset_bias = _mm256_set1_ps(0.0f);

paddle/phi/kernels/funcs/jit/more/intrinsic/layer_norm.cc

@@ -43,7 +43,7 @@ void LayerNorm(float* x,
     __m256 sum;
     __m256 mean_vec, var_vec;
     __m128 hi, lo;
-    __m256 tmp;
+    __m256 tmp = _mm256_setzero_ps();
     size_t offset;
     size_t j;
     __m256 reverse_num_vec =