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inspector: split --cpu-prof-path to --cpu-prof-dir and --cpu-prof-name

Rodrigo Muino Tomonari requested to merge github/fork/joyeecheung/prof-dir into master

To improve the integration of --cpu-prof with workers, this patch splits --cpu-prof-path into --cpu-prof-dir and --cpu-prof-name, so when a worker is launched from a thread that enables --cpu-prof, if the parent thread sets --cpu-prof-dir, then the profile of both thread would be generated to the specified directory. If they end up specifying the same --cpu-prof-name the behavior is undefined - the last profile will overwritten the first one.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines

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