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Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp

Description

Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
release/11.x llvmorg-11.0.0-rc5-0-g60a25202a7d.

MFC after: 4 weeks
X-MFC-With: r364284