[SYCL] reqd_work_group_size attribute is reversed (fix intel#15)

Signed-off-by: Aleksander Fadeev <[email protected]>

Author: fadeeval

clang/include/clang/Basic/Attr.td

@@ -1147,7 +1147,7 @@ def SYCLIntelKernelArgsRestrict : InheritableAttr {
 
 def SYCLIntelNumSimdWorkItems : InheritableAttr {
   let Spellings = [CXX11<"intelfpga","num_simd_work_items">];
-  let Args = [IntArgument<"Number">];
+  let Args = [UnsignedArgument<"Number">];
   let LangOpts = [SYCLIsDevice, SYCLIsHost];
   let Subjects = SubjectList<[Function], ErrorDiag>;
   let Documentation = [SYCLIntelNumSimdWorkItemsAttrDocs];