[Rewriter] Prevent out of range when matching node outputs (#2508)

Trying to bind more outputs (from the pattern) than there are actual
outputs of the candidate node now simply rejects the node before even
trying to index into the list of node outputs.

---------

Signed-off-by: Christoph Berganski <[email protected]>

Author: iksnagreb

onnxscript/rewriter/_matcher.py

@@ -174,6 +174,12 @@ def _match_node(self, pattern_node: _pattern_ir.NodePattern, node: ir.Node) -> b
                 return False
 
         for i, output_value_pattern in enumerate(pattern_node.outputs):
+            # When trying to bind more outputs (from the pattern) than there are
+            # actual outputs of the candidate node, reject the node before even
+            # trying to index into the list of node outputs.
+            if i >= len(node.outputs):
+                return False
+
             if not self._match.bind_value(output_value_pattern, node.outputs[i]):
                 return False