8140249: JVM Crashing During startUp If Flight Recording is enabled

Reviewed-by: dholmes
Contributed-by: NShafi Ahmad <shafi.s.ahmad@oracle.com>

src/cpu/x86/vm/vm_version_x86.hpp

@@ -592,7 +592,7 @@ public:
       result = _cpuid_info.std_cpuid1_ebx.bits.threads_per_cpu /
                cores_per_cpu();
     }
-    return result;
+    return (result == 0 ? 1 : result);
   }
 
   static intx prefetch_data_size()  {