Drop pi nodes for both old/new pred in replace_predecessor

We also need to drop pi nodes for new_pred here, as the pi node
restriction for new_pred is not necessarily true for control

Drop pi nodes for both old/new pred in replace_predecessor

We also need to drop pi nodes for new_pred here, as the pi node
restriction for new_pred is not necessarily true for control
coming from old_pred as well.

Fixes oss-fuzz #40782.

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Handle pi nodes in replace_predecessor

If we're removing a predecessor because it already exists during
replacement, we should also drop pi nodes for that predecessor.

Fixes oss

Handle pi nodes in replace_predecessor

If we're removing a predecessor because it already exists during
replacement, we should also drop pi nodes for that predecessor.

Fixes oss-fuzz #39276.

show more ...