Put XFAIL on two badly broken tests

Author: NagyDonat

clang/test/Analysis/PR37855.c

@@ -2,6 +2,8 @@
 // RUN: %clang_cc1 -analyze -analyzer-checker=core -w -analyzer-config crosscheck-with-z3=true -verify %s
 // REQUIRES: z3
 
+// XFAIL: *
+
 typedef struct o p;
 struct o {
   struct {

clang/test/Analysis/z3-crosscheck.c

@@ -2,6 +2,8 @@
 // RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -analyze -analyzer-checker=core,unix.Malloc,debug.ExprInspection -analyzer-config crosscheck-with-z3=true -verify %s
 // REQUIRES: z3
 
+// XFAIL: *
+
 void clang_analyzer_dump(float);
 
 int foo(int x)