UT FIX: type promotion issue (#2541) (#2547)

* UT FIX: type promotion issue
* fix copysign

---------

Co-authored-by: Jinghui <jinghui.gu@intel.com>

Author: Chao1Han

csrc/gpu/aten/operators/BinaryOps_trig.cpp

@@ -51,7 +51,7 @@ void atan2_kernel(TensorIterator& iter) {
   IPEX_DISPATCH_FLOATING_TYPES_AND2(
       at::ScalarType::BFloat16,
       at::ScalarType::Half,
-      iter.dtype(),
+      iter.common_dtype(),
       "atan2",
       [&]() {
         dpcpp_kernel_for_tensor_iter(

csrc/gpu/aten/operators/GcdLcm.cpp

@@ -17,15 +17,15 @@ namespace AtenIpexTypeXPU {
 namespace impl {
 
 static void gcd_kernel_dpcpp(TensorIterator& iter) {
-  IPEX_DISPATCH_INTEGRAL_TYPES(iter.dtype(), "gcd", [&]() {
+  IPEX_DISPATCH_INTEGRAL_TYPES(iter.common_dtype(), "gcd", [&]() {
     dpcpp_fast_mode_kernel_with_scalars(
         iter,
         [=](scalar_t a, scalar_t b) -> scalar_t { return calc_gcd(a, b); });
   });
 }
 
 static void lcm_kernel_dpcpp(TensorIterator& iter) {
-  IPEX_DISPATCH_INTEGRAL_TYPES(iter.dtype(), "lcm", [&]() {
+  IPEX_DISPATCH_INTEGRAL_TYPES(iter.common_dtype(), "lcm", [&]() {
     dpcpp_fast_mode_kernel_with_scalars(
         iter, [=](scalar_t a, scalar_t b) -> scalar_t {
           scalar_t g = calc_gcd(a, b);

csrc/gpu/aten/operators/comm/LoopsMeta.h

@@ -157,7 +157,7 @@ namespace AtenIpexTypeXPU {
     IPEX_DISPATCH_##types##_AND2(                                             \
         at::ScalarType::Half,                                                 \
         at::ScalarType::BFloat16,                                             \
-        iter.dtype(),                                                         \
+        iter.common_dtype(),                                                  \
         #op,                                                                  \
         [&]() {                                                               \
           dpcpp_kernel_with_scalars(                                          \