[clang] [llvm] Reland "[ORC] Track __emutls_t definitions in IRMaterializationUnit" (#207161) (PR #208413)

[Vassil Vassilev via llvm-commits]

vgvassilev wrote:

> @vgvassilev @lhames — could you take a look?

Can you not put github handles in the pr description because they become part of the commit log and then we get pinged on fork pulls..

https://github.com/llvm/llvm-project/pull/208413