allow ThreadDeath to pass through PythonCExtBuiltins

Author: lukasstadler

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/cext/PythonCextBuiltins.java

@@ -622,6 +622,9 @@ public static Object doExecute(@SuppressWarnings("unused") CApiBuiltinExecutable
 
                 try {
                     return call.execute(cachedSelf, arguments);
+                } catch (ThreadDeath t) {
+                    CompilerDirectives.transferToInterpreter();
+                    throw t;
                 } catch (Throwable t) {
                     CompilerDirectives.transferToInterpreter();
                     t.printStackTrace();