Silently ignore SystemExit in thread runnable

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/ThreadModuleBuiltins.java

@@ -247,6 +247,7 @@ long start(VirtualFrame frame, Object cls, Object callable, Object args, Object
                         if (!IsBuiltinObjectProfile.profileObjectUncached(e.getUnreifiedException(), PythonBuiltinClassType.SystemExit)) {
                             WriteUnraisableNode.getUncached().execute(e.getUnreifiedException(), IN_THREAD_STARTED_BY, callable);
                         }
+                        // SystemExit is silently ignored (see _threadmodule.c: thread_run)
                     } finally {
                         curCount = (int) HiddenAttr.ReadNode.executeUncached(threadModule, THREAD_COUNT, 1);
                         HiddenAttr.WriteNode.executeUncached(threadModule, THREAD_COUNT, curCount - 1);

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/object/BuiltinClassProfiles.java

@@ -240,6 +240,10 @@ public static boolean profileObjectUncached(Object obj, PythonBuiltinClassType t
             return getUncached().profileObject(null, obj, type);
         }
 
+        public static boolean profileExceptionUncached(PException obj, PythonBuiltinClassType type) {
+            return IsBuiltinObjectProfileNodeGen.getUncached().profileException(null, obj, type);
+        }
+
         public static IsBuiltinObjectExactProfile getUncached() {
             return IsBuiltinObjectExactProfileNodeGen.getUncached();
         }