[llvm-dwarfdump] Help option output should be consistent with the command guide
The dwarfdump command guide shows the short options used as aliases but these are not found in the help text unless --show-hidden is used. Investigating other tools some follow this pattern, others like llvm-objdump show aliases with --help. This change fixes the help output to be consistent with the command guide. This includes updating alias descriptions in the help output to use "--". As part of this change I updated cmdline.test, including some options that were missing testing. Differential Revision: https://reviews.llvm.org/D101646
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