e10aa88911
GVN: stop hashing opaque values GVN generates values that are not meant to be unified with any other. For instance `Opaque` (aka we don't know anything), non-deterministic constants and borrows. The current algorithm generates a unique index, so the generated `Value` will be different from all the existing. This is wasteful, as we should not hash that `Value` at all. This PR proposes to do this. This involves partially reimplementing a `FxIndexSet`, but yields a small but consistent perf improvement (https://github.com/rust-lang/rust/pull/145737#issuecomment-3276951054). |
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