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Merge llvm-project release/18.x llvmorg-18-init-18361-g22683463740e

Description

Merge llvm-project release/18.x llvmorg-18-init-18361-g22683463740e

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18-init-18361-g22683463740e.

PR: 276104
MFC after: 1 month