[llvm-branch-commits] [ASan] Make dyld_insert_libraries_reexec work with internal shell (PR #168655)

[Aiden Grossman via llvm-branch-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/168655

This test was doing some feature checks within the test itself. This patch
rewrites the feature checks to be done in a fashion more idiomatic to lit,
as the internal shell does not support the features needed for the previous
feature checks.