[SYCL] Forbid non-const static variable uses in device code (fix intel#6)

Signed-off-by: Aleksander Fadeev <aleksander.fadeev@intel.com>

Author: fadeeval

clang/lib/Sema/SemaExpr.cpp

@@ -211,7 +211,7 @@ bool Sema::DiagnoseUseOfDecl(NamedDecl *D, ArrayRef<SourceLocation> Locs,
                              bool AvoidPartialAvailabilityChecks,
                              ObjCInterfaceDecl *ClassReceiver) {
   if (getLangOpts().SYCLIsDevice) {
-    if (auto VD = dyn_cast<VarDecl>(D)) 
+    if (auto VD = dyn_cast<VarDecl>(D))
       if (VD->getStorageClass() == SC_Static &&
           !VD->getType().isConstant(Context))
         SYCLDiagIfDeviceCode(*Locs.begin(), diag::err_sycl_restrict)