[ELF] ICF: Parallelize eligible section numbering and folding. NFC (#234854)
Count eligible sections per chunk so that they can be numbered
in parallel. In addition, fold sections in parallel.
```
ICF, --threads=8
Chromium 210 -> 183 ms
TensorFlow 114 -> 95 ms
ClickHouse 115 -> 95 ms
Firefox 43 -> 36 ms
```
GitOrigin-RevId: 86c2b093668163b7d7070523e81697e0f3a0ad13
This directory and its subdirectories contain source code for the LLVM Linker, a modular cross platform linker which is built as part of the LLVM compiler infrastructure project.
lld is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.
In order to make sure various developers can evaluate patches over the same tests, we create a collection of self contained programs.
It is hosted at https://s3-us-west-2.amazonaws.com/linker-tests/lld-speed-test.tar.xz
The current sha256 is 10eec685463d5a8bbf08d77f4ca96282161d396c65bd97dc99dbde644a31610f.