[llvm] statically link TableGenTests (#147577) ## Purpose Statically link `TableGenTests` so it can still build when linked against an LLVM Windows DLL. ## Background The effort to build LLVM as a WIndows DLL is tracked in #109483. Additional context is provided in [this discourse](https://discourse.llvm.org/t/psa-annotating-llvm-public-interface/85307). If `TableGenTests` is linked against LLVM built as a DLL on Windows, it will fail due to a large number of duplicate symbols found in both the LLVM DLL and TableGen libraries. This is because `LLVMTableGenBasic` and `LLVMTableGenCommon` are linked statically against LLVM (using `DISABLE_LLVM_LINK_LLVM_DYLIB`) so already contain a sub-set of symbols also exported from the LLVM DLL. This patch was originally part of #145448.
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