I named this task PROFILE_TASK_X86 because it is rigorously tested and we have proven that regrtest performs better on this architecture. Until any other clear evidence and solid measurements that regrtest is performing better on other architectures exists, I'd keep it this way.

Even though this does not threaten the stability of the interpreter in any way, the dual aspect you mentioned appears because CPython 2 and 3 have slightly different makefile rule format. To create a common patch working cross-versions will create a very tangled Makefile. If you all agree that having an unified patch for both versions is acceptable, I will work on that.