Fix global namespace pollution in ATen/Dispatch.h (#13)

Summary:
X-link: facebookexternal/DRTK#2

Pull Request resolved: #13

X-link: pytorch/pytorch#138626

Was it a typo? Since we already have `at::detail` in `ATen/Dispatch.h`

Deleting `::detail` all together, we don't need the functions in it anymore.

Reviewed By: malfet

Differential Revision: D64642080

fbshipit-source-id: 9ae48a888a854ec85e1caef53d87e6e3cc81591b

src/include/kernel_utils.h

@@ -46,9 +46,8 @@ inline int GET_BLOCKS(const int64_t N, const int64_t max_threads_per_block = CUD
 // Dispatches for float and double
 #define AT_DISPATCH_FLOATING_TYPES(TYPE, NAME, ...)                         \
   [&] {                                                                     \
-    const auto& the_type = TYPE;                                            \
+    const at::ScalarType _st = TYPE;                                        \
     /* don't use TYPE again in case it is an expensive or side-effect op */ \
-    at::ScalarType _st = ::detail::scalar_type(the_type);                   \
     switch (_st) {                                                          \
       AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__)     \
       AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__)       \
@@ -60,9 +59,8 @@ inline int GET_BLOCKS(const int64_t N, const int64_t max_threads_per_block = CUD
 // Dispatches for float, double, and half
 #define AT_DISPATCH_FLOATING_TYPES_AND_HALF(TYPE, NAME, ...)                \
   [&] {                                                                     \
-    const auto& the_type = TYPE;                                            \
+    const at::ScalarType _st = TYPE;                                        \
     /* don't use TYPE again in case it is an expensive or side-effect op */ \
-    at::ScalarType _st = ::detail::scalar_type(the_type);                   \
     switch (_st) {                                                          \
       AT_PRIVATE_CASE_TYPE(at::ScalarType::Double, double, __VA_ARGS__)     \
       AT_PRIVATE_CASE_TYPE(at::ScalarType::Float, float, __VA_ARGS__)       \