[Bug ld/28812] New: ld: Make --compress-debug-sections=zlib parallel

[i at maskray dot me]

https://sourceware.org/bugzilla/show_bug.cgi?id=28812

            Bug ID: 28812
           Summary: ld: Make --compress-debug-sections=zlib parallel
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
  Target Milestone: ---

For a -DCMAKE_BUILD_TYPE=Debug build of clang with 265MiB SHF_ALLOC sections
and 920MiB uncompressed debug sections. 
```
% =time -f "CPU: %Us\tReal: %es\tRAM: %MKB" ld.bfd @response.txt -o bfd         
CPU: 69.17s     Real: 78.50s    RAM: 6689800KB
% =time -f "CPU: %Us\tReal: %es\tRAM: %MKB" ld.bfd @response.txt -o bfd
--compress-debug-sections=zlib
CPU: 96.18s     Real: 104.31s   RAM: 7469100KB
```

With a parallel implementation, the compile time can be decreased to below 3
seconds with parallel divide-and-conquer with 8 threads.
I will add a parallel implementation to ld.lld
(https://maskray.me/blog/2022-01-23-compressed-debug-sections).

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