Add test for suppressing LNK4221

Signed-off-by: gejin <[email protected]>

Author: jinge90

clang/test/Driver/suppress_LNK4221_intelfpga_sycl-link.cpp

@@ -0,0 +1,8 @@
+// REQUIRES: system-windows
+// RUN:  %clangxx -fsycl -fintelfpga -fsycl-link -Xshardware %s 2>&1 \
+// RUN:  | FileCheck %s
+// CHECK: No kernels specified.
+// CHECK-NOT: LNK4221
+int main() {
+  return 0;
+}