[SYCL][NFCI] Remove SYCL 1.2.1 code (#16118)

Remove 1.2.1 code as mentioned in
#15890

sycl/include/sycl/aliases.hpp

@@ -140,19 +140,11 @@ using cl_double = double;
 } // namespace opencl
 
 // Vector aliases are different between SYCL 1.2.1 and SYCL 2020
-#if SYCL_LANGUAGE_VERSION >= 202001
 __SYCL_2020_MAKE_VECTOR_ALIASES_FOR_VECTOR_LENGTH(2)
 __SYCL_2020_MAKE_VECTOR_ALIASES_FOR_VECTOR_LENGTH(3)
 __SYCL_2020_MAKE_VECTOR_ALIASES_FOR_VECTOR_LENGTH(4)
 __SYCL_2020_MAKE_VECTOR_ALIASES_FOR_VECTOR_LENGTH(8)
 __SYCL_2020_MAKE_VECTOR_ALIASES_FOR_VECTOR_LENGTH(16)
-#else
-__SYCL_MAKE_VECTOR_ALIASES_FOR_VECTOR_LENGTH(2)
-__SYCL_MAKE_VECTOR_ALIASES_FOR_VECTOR_LENGTH(3)
-__SYCL_MAKE_VECTOR_ALIASES_FOR_VECTOR_LENGTH(4)
-__SYCL_MAKE_VECTOR_ALIASES_FOR_VECTOR_LENGTH(8)
-__SYCL_MAKE_VECTOR_ALIASES_FOR_VECTOR_LENGTH(16)
-#endif
 } // namespace _V1
 } // namespace sycl
 

sycl/include/sycl/handler.hpp

@@ -67,18 +67,7 @@
 // 41(!!!) includes of SYCL headers + 10 includes of standard headers.
 // 3300+ lines of code
 
-// SYCL_LANGUAGE_VERSION is 4 digit year followed by 2 digit revision
-#if !SYCL_LANGUAGE_VERSION || SYCL_LANGUAGE_VERSION < 202001
-#define __SYCL_NONCONST_FUNCTOR__
-#endif
-
-// replace _KERNELFUNCPARAM(KernelFunc) with   KernelType KernelFunc
-//                                     or     const KernelType &KernelFunc
-#ifdef __SYCL_NONCONST_FUNCTOR__
-#define _KERNELFUNCPARAMTYPE KernelType
-#else
 #define _KERNELFUNCPARAMTYPE const KernelType &
-#endif
 #define _KERNELFUNCPARAM(a) _KERNELFUNCPARAMTYPE a
 
 #if defined(__SYCL_UNNAMED_LAMBDA__)

sycl/include/sycl/queue.hpp

@@ -56,11 +56,8 @@
 // these macros are #undef immediately.
 // replace _KERNELFUNCPARAM(KernelFunc) with   KernelType KernelFunc
 //                                     or     const KernelType &KernelFunc
-#ifdef __SYCL_NONCONST_FUNCTOR__
-#define _KERNELFUNCPARAM(a) KernelType a
-#else
+
 #define _KERNELFUNCPARAM(a) const KernelType &a
-#endif
 
 namespace sycl {
 inline namespace _V1 {