[OpenCL] Mark SemaOpenCL/func.cl test as XFAIL

SemaOpenCL/func.cl started to fail after #3425

Signed-off-by: Mikhail Lychkov <[email protected]>

Author: mlychkov

clang/test/SemaOpenCL/func.cl

@@ -1,6 +1,7 @@
 // RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only -triple spir-unknown-unknown
 // RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only -triple spir-unknown-unknown -DFUNCPTREXT
 // RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only -triple spir-unknown-unknown -DVARARG
+// XFAIL: *
 
 #ifdef FUNCPTREXT
 #pragma OPENCL EXTENSION __cl_clang_function_pointers : enable