[clang] [Clang][Driver] Override Generic_ELF::buildLinker() to avoid calling gcc to link (PR #149681)

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mintsuki wrote:

A bunch of tests fail now... I feel like this change is too invasive for what I can possibly do on my own, but I hope that the original commit message is helpful in describing the problem at hand.

https://github.com/llvm/llvm-project/pull/149681