[llvm-branch-commits] [compiler-rt] [RTSan] Cherry pick rtsan osspinlock fix to release/20.x (PR #137353)

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davidtrevelyan wrote:

Hi all (@thetruestblue @wrotki @aemerson) - is there anything further you need from me or @cjappl for this one? Let us know if there's anything we can do. 

https://github.com/llvm/llvm-project/pull/137353