[Bug binutils/16523] support xz compression of debug info files

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=16523

Fangrui Song <i at maskray dot me> changed:

           What    |Removed                     |Added
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                 CC|                            |i at maskray dot me

--- Comment #1 from Fangrui Song <i at maskray dot me> ---
We now have --compress-debug-sections=zstd as another choice. To achieve a
similar compression ratio like xz, zstd is slower to compress, but the
decompression is much faster.

Example:
https://archlinux.org/news/now-using-zstandard-instead-of-xz-for-package-compression/
says
"zstd and xz trade blows in their compression ratio. Recompressing all packages
to zstd with our options yields a total ~0.8% increase in package size on all
of our packages combined, but the decompression time for all packages saw a
~1300% speedup."

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