[SYCL] Align sub-group implementation and docs (#1922)

- Deprecate two-input shuffles
- Fix linear_id type (size_t => uint32_t)
- Add linear ID queries
- Remove fence_space from barrier

Signed-off-by: John Pennycook <[email protected]>

Author: Pennycook

sycl/include/CL/sycl/detail/defines.hpp

@@ -47,6 +47,12 @@
 #endif
 #endif
 
+#ifdef _WIN32
+#define __SYCL_DEPRECATED(message) __declspec(deprecated(message))
+#else
+#define __SYCL_DEPRECATED(message) __attribute__((deprecated(message)))
+#endif
+
 // inline constexpr is a C++17 feature
 #if __cplusplus >= 201703L
 #define __SYCL_INLINE_CONSTEXPR inline constexpr