Guillaume Gomez
786d828710
Remove double check when decoding ExpnId to avoid races Fixes debug assertion failure as described in https://github.com/rust-lang/rust/issues/141540#issuecomment-3462723909 Essentially failure happens during the race while decoding one `ExpnId` from different threads. This ICE doesn't happen with single threaded thread_pool due to early return within `decode_expn_id` with the same condition: https://github.com/rust-lang/rust/blob/8205e6b75ec656305ac235d4726d2c7a1ddcef14/compiler/rustc_middle/src/query/on_disk_cache.rs#L605-L607 However I believe this race does not hurt because `register_expn_id` is pretty much idempotent: https://github.com/rust-lang/rust/blob/8205e6b75ec656305ac235d4726d2c7a1ddcef14/compiler/rustc_span/src/hygiene.rs#L1397-L1413
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