[Chapel Merge] Avoid using the Chapel built installs of llvm on s

Branch: refs/heads/master
Revision: bd3e9d9
Author: daviditen
Log Message:

Merge pull request #17573 from daviditen/official-system-llvm

Avoid using the Chapel built installs of llvm on system llvm testing

[reviewed by @ronawho]

This test configuration has an official install of llvm on the system that it
is intended to test with. Avoid introducing our Chapel built versions in this
configuration.

Signed-off-by: David Iten daviditen@users.noreply.github.com

Modified Files:
M util/cron/common.bash

M util/cron/test-llvm.system.bash

Compare: https://github.com/chapel-lang/chapel/compare/ecd82439de68...bd3e9d9babc3