[SYCL] Skip initialization in default vec constructor

This initialization is unnecessary and might lead to poor performance.

Signed-off-by: Alexey Bader <[email protected]>

Author: bader

sycl/include/CL/sycl/types.hpp

@@ -357,7 +357,7 @@ template <typename Type, int NumElements> class vec {
   using vector_t = DataType;
 #endif
 
-  vec() { m_Data = {0}; }
+  vec() = default;
 
   // TODO Remove this difference between host and device side after
   // when root cause of API incompatibility will be fixed