[llvm-branch-commits] [UTC] Strip only standalone positional %s in update_test_checks.py (PR #221153)

[Alexander Richardson via llvm-branch-commits]

arichardson wrote:

A while ago I made a draft change to use the lit shell code for running commands in the update scripts so that these variables are expanded sensibly. Let me see if I can find this again. Until then I think this workaround seems sensible.

https://github.com/llvm/llvm-project/pull/221153