[LLVM] Bump to 3b264487a - #708

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache/restore@v3, actions/checkout@v4.2.2, actions/setup-python@v4, actions/upload-artifact@v4, szenius/set-timezone@v2.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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'get_temporary_buffer<std::pair<unsigned long, llvm::Function *>>' is deprecated [-Wdeprecated-declarations]

'get_temporary_buffer<std::pair<unsigned int, llvm::MDNode *>>' is deprecated [-Wdeprecated-declarations]

'get_temporary_buffer<mlir::OpOperand>' is deprecated [-Wdeprecated-declarations]

'get_temporary_buffer<std::pair<const void *, (anonymous namespace)::AliasInitializer::InProgressAliasInfo>>' is deprecated [-Wdeprecated-declarations]

'get_temporary_buffer<mlir::detail::ParallelDiagnosticHandlerImpl::ThreadDiagnostic>' is deprecated [-Wdeprecated-declarations]

'get_temporary_buffer<llvm::directive::Spelling>' is deprecated [-Wdeprecated-declarations]

'get_temporary_buffer<std::pair<const llvm::Init *, const llvm::Init *>>' is deprecated [-Wdeprecated-declarations]

'get_temporary_buffer<llvm::TrackingStatistic *>' is deprecated [-Wdeprecated-declarations]

'get_temporary_buffer<std::pair<float, llvm::BPFunctionNode *>>' is deprecated [-Wdeprecated-declarations]