[SYC] Remove macro from user name space. (#3480)

The name of the macro that disables range rounding has been changed to protect from potential conflict with a user-defined macro.

Signed-off-by: rdeodhar <rajiv.deodhar@intel.com>

Author: rdeodhar

sycl/include/CL/sycl/handler.hpp

@@ -738,7 +738,7 @@ class __SYCL_EXPORT handler {
     // Range rounding can be disabled by the user.
     // Range rounding is not done on the host device.
     // Range rounding is supported only for newer SYCL standards.
-#if !defined(SYCL_DISABLE_PARALLEL_FOR_RANGE_ROUNDING) &&                      \
+#if !defined(__SYCL_DISABLE_PARALLEL_FOR_RANGE_ROUNDING__) &&                  \
     !defined(DPCPP_HOST_DEVICE_OPENMP) &&                                      \
     !defined(DPCPP_HOST_DEVICE_PERF_NATIVE) && SYCL_LANGUAGE_VERSION >= 202001
     // Range should be a multiple of this for reasonable performance.
@@ -825,7 +825,7 @@ class __SYCL_EXPORT handler {
       MCGType = detail::CG::KERNEL_V1;
 #endif
     } else
-#endif // !SYCL_DISABLE_PARALLEL_FOR_RANGE_ROUNDING &&                         \
+#endif // !__SYCL_DISABLE_PARALLEL_FOR_RANGE_ROUNDING__ &&                     \
        // !DPCPP_HOST_DEVICE_OPENMP && !DPCPP_HOST_DEVICE_PERF_NATIVE &&       \
        // SYCL_LANGUAGE_VERSION >= 202001
     {