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25daa6d670
llvm-readelf is a user-facing tool which emulates GNU readelf. Remove one-dash long options which are not recognized by GNU style `getopt_long`. This ensures long options cannot collide with grouped short options. Note: the documentation (D63719)/help messages have recommended the double-dash forms since LLVM 9.0.0. llvm-readobj is intended as an internal tool which has some flexibility. llvm-readelf/llvm-readobj use the same option parsing code and llvm-readobj's one-dash long options aren't used after test migration. Differential Revision: https://reviews.llvm.org/D106037