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

[via cfe-commits]

wangleiat wrote:

`LoongArch` does not support `emulated TLS`, which causes this test to
fail on [LoongArch buildbots](https://lab.llvm.org/staging/#/builders/20/builds/28875). Pr #208886 marks the test as `UNSUPPORTED` for LoongArch targets.

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