[12.0.0][llvm-symbolizer][test] Fix test broken after cherry-pick

See bug https://bugs.llvm.org/show_bug.cgi?id=49227. The cherry-pick 0d4f8a3f364f introduced a test failure, as the test included use of a feature that was only recently added to lit and isn't in the release branch. This patch fixes up the test to manage without this lit change.

Reviewed By: tstellar, MaskRay

Differential Revision: https://reviews.llvm.org/D97272