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Merge llvm-project release/15.x llvmorg-15.0.0-rc2-40-gfbd2950d8d0d

Description

Merge llvm-project release/15.x llvmorg-15.0.0-rc2-40-gfbd2950d8d0d

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-15.0.0-rc2-40-gfbd2950d8d0d.

PR: 265425
MFC after: 2 weeks