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Partially revert "Add initial tests for update_{llc_,cc_,}test_checks.py"

Authored by rnk on Dec 26 2019, 8:46 AM.

Description

Partially revert "Add initial tests for update_{llc_,cc_,}test_checks.py"

This reverts part of commit 240aff80e0e59b79779d046b3275904fc0750d59.
It reverts cc802ea67beb66d2f8a935e647c3aedcf7848211.

We currently run LLVM tests in environments where python3 exists on
PATH, but it is broken. I don't think PATH discovery is a strong enough
signal that a working Python 3 installation exists.

If this will be the way forward, IMO we should follow the direction of
debug-info-tests, and use CMake's PYTHON_EXECUTABLE, which in the near
future will be a known-to-work Python 3 executable. If it's not Python
3, then we don't have to run this test.

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