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rustc hangs with release build since the llvm 21 merge on crate not on crates.io #145988

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A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bugCategory: This is a bug. I-hangIssue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc. I-prioritizeIssue: Indicates that prioritization has been requested for this issue. T-compilerRelevant to the compiler team, which will review and decide on the PR/issue. llvm-fixed-upstreamIssue expected to be fixed by the next major LLVM upgrade, or backported fixes regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.
@Count-Count

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Steps to reproduce:

git clone -b v0.0.10 https://gitlab.wikimedia.org/countcount/wikimedia-eventstreams
cd wikimedia-eventstreams/
cargo +nightly build --release

Build hangs on last step. Bisected to dc0bae1

Works fine with 1.89 or non-release builds.

Sorry, but I don't have time to minimize right now, will try later if I find the time.

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    A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bugCategory: This is a bug. I-hangIssue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc. I-prioritizeIssue: Indicates that prioritization has been requested for this issue. T-compilerRelevant to the compiler team, which will review and decide on the PR/issue. llvm-fixed-upstreamIssue expected to be fixed by the next major LLVM upgrade, or backported fixes regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.

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