91b90652bb
Initially added in #187709. It was reverted in #188833, because [llvm-clang-x86_64-sie-win](https://lab.llvm.org/buildbot/#/builders/46/builds/32873) was failing in `cross-project-tests/debuginfo-tests/dexter-tests/nrvo.cpp`. The test passed for me locally. After checking on another machine, I found that `S_DEFRANGE_REGISTER_REL_INDIR` is only supported by dbgeng/WinDbg from Windows 10.0 Build 19041 (released 2020) onwards. SDKs before this will fail to read the value. That buildbot is on Windows 10.0 Build 17763. I'm not sure if we should make the generation of that record conditional. Debuggers that can't read the record will skip it. They'll still see that there's some local variable, but won't be able to display the value. As far as I know, users of older Windows 10 builds should be able to install a newer Windows SDK and use the WinDbg from that version. But I haven't tested that.
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