[llvm] [Dexter] Fix test failures on greendragon (PR #66299)

[Shubham Sandeep Rastogi via llvm-commits]

rastogishubham wrote:

@SLTozer Sounds good, I will merge this because greendragon is unstable, and we are seeing XPASSES, and then we can make the dsym location configurable in a future patch!

https://github.com/llvm/llvm-project/pull/66299