Fix compile on M1 Mac (#8999)
Add arm64 to the list of known stack growth directions.
diff --git a/iocore/eventsystem/UnixEventProcessor.cc b/iocore/eventsystem/UnixEventProcessor.cc
index 2217d61..bbe17f1 100644
--- a/iocore/eventsystem/UnixEventProcessor.cc
+++ b/iocore/eventsystem/UnixEventProcessor.cc
@@ -140,7 +140,8 @@
void
ThreadAffinityInitializer::setup_stack_guard(void *stack, int stackguard_pages)
{
-#if !(defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__mips__))
+#if !(defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__arm64__) || defined(__aarch64__) || \
+ defined(__mips__))
#error Unknown stack growth direction. Determine the stack growth direction of your platform.
// If your stack grows upwards, you need to change this function and the calculation of stack_begin in do_alloc_stack.
#endif
