"Reapply "[Clang] Enable lit internal shell by default" This reverts commit 32de3b9ef9e7e8debc14416e968456ca13b48bea. This relands the enablement of the internal shell for clang by default. This was reverted last time for some Z3 failures that were fixed in 2d550b98cac5. There was also issues around ulimit values persisting causing test failures in LLVM. Those were addressed in 93dd17a0e0a4.
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