[clang] [DTLTO][TEST] Get the DTLTO Clang driver tests failing on some buildbots to pass (PR #159158)

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bd1976bris wrote:

Hi @petrhose. This is the same fix as you approved in #159050. It's not ideal but there's not loss of coverage given the DTLTO testing in the `cross-poject-test` area. I would like to make this patch to get the bot green, rather than reverting the previous chain of commits, and then subsequently replace with something hopefully along the lines of PR #159151.

https://github.com/llvm/llvm-project/pull/159158