Auto merge of #77793 - tmiasko:no-op-discriminant, r=ecstatic-morse
Recognize discriminant reads as no-ops in RemoveNoopLandingPads The cleanup blocks often contain read of discriminants. Teach RemoveNoopLandingPads to recognize them as no-ops to remove additional no-op landing pads.
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@ -43,7 +43,7 @@ impl RemoveNoopLandingPads {
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// These are all nops in a landing pad
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}
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StatementKind::Assign(box (place, Rvalue::Use(_))) => {
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StatementKind::Assign(box (place, Rvalue::Use(_) | Rvalue::Discriminant(_))) => {
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if place.as_local().is_some() {
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// Writing to a local (e.g., a drop flag) does not
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// turn a landing pad to a non-nop
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