ctest treat clang warning as error
It pollutes cdash dashboard. https://cdash.qmcpack.org/CDash/viewBuildError.php?buildid=122446
Clang warning doesn't get categorized properly.
warning: :0:0: loop not vectorized: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering [-Wpass-failed=transform-warning]
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