Disable tests on SLC6 32 bit.

test/NullDeref/Load.C

@@ -1,5 +1,6 @@
 // RUN: cat %s | %cling -Xclang -verify
 //This file checks a pointer load operation for null prt dereference.
+// XFAIL: i686-pc-linux-gnu
 int *p;
 int x;
 x = *p; // expected-warning {{null passed to a callee which requires a non-null argument}}

test/NullDeref/NonNullArg.C

@@ -1,7 +1,8 @@
 // RUN: cat %s | %cling -Xclang -verify | FileCheck %s
 //This file checks a call instruction. The called function has arguments with nonnull attribute.
 #include <string.h>
-//XFAIL: darwin
+// XFAIL: darwin
+// XFAIL: i686-pc-linux-gnu
 
 char *p = 0;
 strcmp("a", p); // expected-warning {{warning: null passed to a callee which requires a non-null argument}}

test/NullDeref/NonNullArgCustom.C

@@ -5,6 +5,7 @@
 // attribute to a say library function.
 
 // Qualified functions.
+// XFAIL: i686-pc-linux-gnu
 extern "C" int printf(const char* fmt, ...);
 namespace custom_namespace {
   void standaloneFunc(void* p, int q, float* s) __attribute__((nonnull(1,3))) { // expected-warning {{GCC does not allow nonnull attribute in this position on a function definition}}

test/NullDeref/Store.C

@@ -1,6 +1,7 @@
 // RUN: cat %s | %cling -Xclang -verify
 
 //This file checks a pointer store operation for null ptr dereference.
+// XFAIL: i686-pc-linux-gnu
 int *p;
 *p = 6; // expected-warning {{null passed to a callee which requires a non-null argument}}
 .q