Patch Redis 3.2 code to compile cleanly for Apple M1 Macs (ARM)

redis-3.2-arm64.patch

diff --git a/src/debug.c b/src/debug.c
index 1ecb251bd..d4d2f0508 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -662,8 +662,10 @@ static void *getMcontextEip(ucontext_t *uc) {
     /* OSX >= 10.6 */
     #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
     return (void*) uc->uc_mcontext->__ss.__rip;
-    #else
+    #elif defined(__i386__)
     return (void*) uc->uc_mcontext->__ss.__eip;
+    #else
+    return NULL;
     #endif
 #elif defined(__linux__)
     /* Linux */
@@ -731,7 +733,7 @@ void logRegisters(ucontext_t *uc) {
         (unsigned long) uc->uc_mcontext->__ss.__gs
     );
     logStackContent((void**)uc->uc_mcontext->__ss.__rsp);
-    #else
+    #elif defined(__i386__)
     /* OSX x86 */
     serverLog(LL_WARNING,
     "\n"
@@ -757,6 +759,9 @@ void logRegisters(ucontext_t *uc) {
         (unsigned long) uc->uc_mcontext->__ss.__gs
     );
     logStackContent((void**)uc->uc_mcontext->__ss.__esp);
+    #else
+    serverLog(LL_WARNING,
+        "  Dumping of registers not supported for this OS/arch");
     #endif
 /* Linux */
 #elif defined(__linux__)