[clang] [flang] [flang][debug] Add compressed DWARF support in Flang (PR #212584)

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+! Test -gz=zstd (compressed debug sections with zstd) option handling.
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+! REQUIRES: zstd
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timsmith78 wrote:

Ah, good catch!  I'll add that...

https://github.com/llvm/llvm-project/pull/212584