Fix build error on s390x

Author: vivkong

CoreFoundation/Base.subproj/CFInternal.h

@@ -171,9 +171,13 @@ CF_PRIVATE CFIndex __CFActiveProcessorCount();
 #define __builtin_unreachable() do { } while (0)
 #endif
 
-#if defined(__i386__) || defined(__x86_64__)
-    #if defined(__GNUC__)
-        #define HALT do {asm __volatile__("int3"); kill(getpid(), 9); __builtin_unreachable(); } while (0)
+#if defined(__i386__) || defined(__x86_64__) || defined(__s390x__)
+    #if defined(__GNUC__) 
+        #if defined(__s390x__)
+          #define HALT do {__builtin_trap(); kill(getpid(), 9); __builtin_unreachable(); } while (0)
+        #else
+          #define HALT do {asm __volatile__("int3"); kill(getpid(), 9); __builtin_unreachable(); } while (0)
+        #endif
     #elif defined(_MSC_VER)
         #define HALT do { DebugBreak(); abort(); __builtin_unreachable(); } while (0)
     #else