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Merge llvm-project release/18.x llvmorg-18.1.6-0-g1118c2e05e67

Description

Merge llvm-project release/18.x llvmorg-18.1.6-0-g1118c2e05e67

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.6-0-g1118c2e05e67.

PR: 276104
MFC after: 3 days