[SYCL] Fix the problem with exported symbol on Windows (#4200)

The function handler::getDelinearizedIndex() has got into sycl.dll because
it is a static symbol of the exported class 'handler'. The function is
unused, but must stay in library until ABI breaking changes are allowed.

Signed-off-by: Vyacheslav N Klochkov <[email protected]>

Author: v-klochkov

sycl/include/CL/sycl/handler.hpp

@@ -568,6 +568,20 @@ class __SYCL_EXPORT handler {
     return true;
   }
 
+  // TODO: Delete these functions when ABI breaking changes are allowed.
+  // Currently these functions are unused but they are static members of
+  // the exported class 'handler' and has got into sycl library some time ago
+  // and must stay there for a while.
+  static id<1> getDelinearizedIndex(const range<1> Range, const size_t Index) {
+    return detail::getDelinearizedId(Range, Index);
+  }
+  static id<2> getDelinearizedIndex(const range<2> Range, const size_t Index) {
+    return detail::getDelinearizedId(Range, Index);
+  }
+  static id<3> getDelinearizedIndex(const range<3> Range, const size_t Index) {
+    return detail::getDelinearizedId(Range, Index);
+  }
+
   /// Handles some special cases of the copy operation from one accessor
   /// to another accessor. Returns true if the copy is handled here.
   ///