Put back the XFAIL.

test/CodeUnloading/Dtors.C

@@ -7,6 +7,7 @@
 //------------------------------------------------------------------------------
 
 // RUN: cat %s | %cling 2>&1 | FileCheck %s
+// XFAIL:*
 extern "C" int printf(const char* fmt, ...);
 // force emission of cxa_atexit such that it doesn't pollute the diff.
 class MyClass{public: ~MyClass(){} }mm;