RFR: Fallback xctrace profiler resolution on SDKROOT env variable

[Galder Zamarreño]

On Tue, 1 Apr 2025 08:06:18 GMT, Galder Zamarreño <galder at openjdk.org> wrote:

> If `xctrace` cannot be found via `xcode-select` it checks the SDKROOT environment variable.
> 
> @fzhinkin Can you have a look?

In fact, I might not need to fix JMH if `xcode-select` picks that up. I'll give that a go first

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PR Comment: https://git.openjdk.org/jmh/pull/155#issuecomment-2772098056