8165153: Crash in rebuild_cpu_to_node_map

Summary: use processor_count(), not active_processor_count() to determine physical number of CPUs
Reviewed-by: rehn, cjplummer

src/os/linux/vm/os_linux.cpp

@@ -2854,7 +2854,7 @@ void os::Linux::rebuild_cpu_to_node_map() {
                               // in the library.
   const size_t BitsPerCLong = sizeof(long) * CHAR_BIT;
 
-  size_t cpu_num = os::active_processor_count();
+  size_t cpu_num = processor_count();
   size_t cpu_map_size = NCPUS / BitsPerCLong;
   size_t cpu_map_valid_size =
     MIN2((cpu_num + BitsPerCLong - 1) / BitsPerCLong, cpu_map_size);