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

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@@ -15,6 +15,7 @@
 #include "clang/Options/OptionUtils.h"
 #include "clang/Options/Options.h"
 #include "llvm/Frontend/Debug/Options.h"
+#include "llvm/Support/Compression.h"
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chichunchen wrote:

This is unused.

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