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[win][ci] Update LLVM toolchain used to build LLVM to 20 #140757

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dpaoliello
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While trying to get the aarch64-msvc build working correctly (#140136), I needed to update the version of LLVM used to build LLVM in Windows CI runners to 20 (as this has improved support for Arm64 and Arm64EC on Windows).

This catches Windows up to Linux which was updated to 20 by #137189

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rustbot commented May 7, 2025

r? @jdno

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@rustbot rustbot added A-testsuite Area: The testsuite used to check the correctness of rustc S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue. labels May 7, 2025
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Kobzol commented May 7, 2025

The new LLVM version will need to be mirrored, see https://github.com/rust-lang/ci-mirrors.

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The new LLVM version will need to be mirrored, see https://github.com/rust-lang/ci-mirrors.

Already done and merged: rust-lang/ci-mirrors#11

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Kobzol commented May 7, 2025

Oh, you're fast 😆 I forgot about that. Great.

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A-testsuite Area: The testsuite used to check the correctness of rustc S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue.
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