Fix throwing of yield from related exceptions into generator

Use the general zend_generator_throw_exception() helper for this.
Otherwise we don't handle the off-by-one opline correctly (should
we maybe just stop doing that?)

This is a followup to ad750c3,
which fixed a different yield from exception handling problem that
happened to show up in the same test case from oss-fuzz #25321.
Now both issues should be fixed.

Zend/tests/generators/yield_from_valid_exception.phpt

@@ -15,7 +15,8 @@ class FooBar implements Iterator {
 
 function gen() {
     try {
-        yield from new FooBar;
+        // the fact that the yield from result is used is relevant.
+        var_dump(yield from new FooBar);
     } catch (Exception $e) {
         echo $e->getMessage(), "\n";
     }

Zend/zend_generators.c

@@ -740,7 +740,7 @@ static int zend_generator_get_next_delegated_value(zend_generator *generator) /*
 	return SUCCESS;
 
 exception:
-	zend_rethrow_exception(generator->execute_data);
+	zend_generator_throw_exception(generator, NULL);
 
 failure:
 	zval_ptr_dtor(&generator->values);