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Add support for zstd compressed debug sections (#318) #364

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Add support for zstd compressed debug sections (#318) #364

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Commits on Oct 20, 2023

  1. Add support for zstd compressed debug sections (google#318) 

    Add support for processing zstd compressed debug sections. `lld` and associated tools now support using `zstd` in addition to `zlib` for debug info compression, for example:

```
clang++ -gz=zstd foo.cc

clang++ -shared -W,--compress-debug-sections=zstd foo.cc

llvm-objcopy --compress-debug-sections=zstd foo.o foo-compressed.o
```

This CL:
- Adds a dependency on `zstd`
- Handles the `ELFCOMPRESS_ZSTD` `ch_type` flag
- Uses `zstd` to decompress sections marked with `ELFCOMPRESS_ZSTD`
    @EricRahm
    EricRahm committed Oct 20, 2023
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