[Flang] Enable lit's internal shell by default Lit's internal shell is faster as it avoids the overhead of needing to fork bash for every run line, and also provides better debug information on failures. Now that all of flang's tests work correctly with lit's internal shell, we can enable it by default to take advantage of the benefits. Towards #102704. Reviewers: clementval, kiranchandramohan, Meinersbur Reviewed By: clementval Pull Request: https://github.com/llvm/llvm-project/pull/156116
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