Set context of internal exceptions to cause

Author: msimacek

graalpython/com.oracle.graal.python.test/src/tests/unittest_tags/test_generator_stop.txt

@@ -1 +1,2 @@
 *graalpython.lib-python.3.test.test_generator_stop.TestPEP479.test_stopiteration_wrapping
+*graalpython.lib-python.3.test.test_generator_stop.TestPEP479.test_stopiteration_wrapping_context

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/PRaiseNode.java

@@ -180,6 +180,7 @@ PException doBuiltinTypeWithCause(PythonBuiltinClassType type, PBaseException ca
                     @Shared("factory") @Cached PythonObjectFactory factory) {
         assert format != null;
         PBaseException baseException = factory.createBaseException(type, format, arguments);
+        baseException.setContext(cause);
         baseException.setCause(cause);
         throw raise(baseException);
     }