Change `asan/TestCases/Darwin/malloc_zone-protected.cpp` to call abort so that it **always crashes**.

[delcypher]

Summary

This is needed because on some platforms we can't install signal
handlers and so the application just traps (i.e. crashes) rather than being intercepted
by ASan's signal handler which in the default Darwin config doesn't
exit with a crashing exit code.

rdar://problem/57984547

compiler-rt/test/asan/TestCases/Darwin/malloc_zone-protected.cpp

 // Make sure the zones created by malloc_create_zone() are write-protected.
 #include <malloc/malloc.h>
 #include <stdio.h>
 
 // RUN: %clangxx_asan %s -o %t
-// RUN: not %run %t 2>&1 | FileCheck %s
+// RUN: ASAN_OPTIONS="abort_on_error=1" not --crash %run %t 2>&1 | FileCheck %s
 
 
 void *pwn(malloc_zone_t *unused_zone, size_t unused_size) {
   printf("PWNED\n");
   return NULL;
 }
 
 int main() {
   malloc_zone_t *zone = malloc_create_zone(0, 0);
   zone->malloc = pwn;
   void *v = malloc_zone_malloc(zone, 1);
   // CHECK-NOT: PWNED
   return 0;
 }