[clang][Interp] Try to fix builtin-functions test on AIX

See
0a739eb#commitcomment-139850284

Author: tbaederr

clang/test/AST/Interp/builtin-functions.cpp

@@ -514,7 +514,9 @@ namespace bswap {
 #define CFSTR __builtin___CFStringMakeConstantString
 void test7(void) {
   const void *X;
+#if !defined(_AIX)
   X = CFSTR("\242"); // both-warning {{input conversion stopped}}
+#endif
   X = CFSTR("\0"); // no-warning
   X = CFSTR(242); // both-error {{cannot initialize a parameter of type 'const char *' with an rvalue of type 'int'}}
   X = CFSTR("foo", "bar"); // both-error {{too many arguments to function call}}