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Summary: Add DefaultOption flag to CommandLineParser which provides a default option or alias, but allows users to override it for some other purpose as needed. Also, add `-h` as a default alias to `-help`, which can be seamlessly overridden by applications like llvm-objdump and llvm-readobj which use `-h` as an alias for other options. (relanding after revert, r358414) Added DefaultOptions.clear() to reset(). Reviewers: alexfh, klimek Reviewed By: klimek Subscribers: kristina, MaskRay, mehdi_amini, inglorion, dexonsmith, hiraditya, llvm-commits, jhenderson, arphaman, cfe-commits Tags: #clang, #llvm Differential Revision: https://reviews.llvm.org/D59746 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358428 91177308-0d34-0410-b5e6-96231b3b80d8