[SYCL] Add support for assert in windows NVPTX (#6215)

Until cxx standard library for NVPTX extension is implemented _wassert is provided
by libclc, that passes it to a call to __assertfail.

Fixes #5922

Author: jchlanda

libclc/ptx-nvidiacl/libspirv/assert/__assert_fail.cl

@@ -7,3 +7,8 @@ _CLC_DECL void __assert_fail(const char *expr, const char *file,
                              unsigned int line, const char *func) {
   __assertfail(expr, file, line, func);
 }
+
+_CLC_DECL void _wassert(const char *_Message, const char *_File,
+                        unsigned _Line) {
+  __assertfail(_Message, _File, _Line, 0);
+}