[Bug ld/27452] ld: Support compressing arbitrary sections (generalized --compress-debug-sections=)

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=27452

--- Comment #2 from Fangrui Song <i at maskray dot me> ---
I find it very difficult to handle SHF_ALLOC sections due to data commands,
range extension thunks, and other features requiring fixed-point iteration.

Compressing non-SHF_ALLOC sections alone may yield a significant value, e.g.
compressing .symtab and .strtab .

On the lld side, I've created https://github.com/llvm/llvm-project/pull/84855 .
 We are debating whether the option should be named 
--compress-sections <section-glob>=[none|zlib|zstd] or
--compress-nonalloc-sections

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