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Merge llvm-project release/18.x llvmorg-18.1.0-rc3-0-g6c90f8dd5463

Description

Merge llvm-project release/18.x llvmorg-18.1.0-rc3-0-g6c90f8dd5463

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvm-project release/18.x llvmorg-18.1.0-rc3-0-g6c90f8dd5463.

PR: 276104
MFC after: 1 month