Merge pull request #428 from devnexen/netbsd_arch_trace_arm64

arch_getPC: netbsd arm64 support.

netbsd/trace.c

diff --git a/netbsd/trace.c b/netbsd/trace.c
index 30b21dc..76f6464 100644
--- a/netbsd/trace.c
+++ b/netbsd/trace.c
@@ -185,6 +185,8 @@
     *status_reg = r.regs[_REG_EFLAGS];
 #elif defined(__x86_64__)
     *status_reg = r.regs[_REG_RFLAGS];
+#elif defined(__aarch64__)
+    *status_reg = r.r_spsr;
 #else
 #error unsupported CPU architecture
 #endif