[lld][COFF] Add optimization remarks options to lld-link (#205390)

Add support for emitting optimization remarks during LTO in the COFF
 linker, matching the existing ELF linker functionality. The following
 options are added:

   -opt-remarks-filename
   -opt-remarks-passes
   -opt-remarks-format
   -opt-remarks-with-hotness
   -opt-remarks-hotness-threshold

 These options are forwarded to the LTO backend via lto::Config and
 allow users to capture optimization decisions (e.g., inlining) as
 structured YAML output, optionally filtered by pass name or profile
 hotness threshold.

Assisted by Claude.

GitOrigin-RevId: a037d2ad7312adc58664358893c20927efae22cf
5 files changed
tree: a39c3542a0cbdfde228d0668a2c3e9d04c515514
  1. cmake/
  2. COFF/
  3. Common/
  4. docs/
  5. ELF/
  6. include/
  7. MachO/
  8. MinGW/
  9. test/
  10. tools/
  11. unittests/
  12. utils/
  13. wasm/
  14. .clang-format
  15. .clang-tidy
  16. .gitignore
  17. CMakeLists.txt
  18. LICENSE.TXT
  19. Maintainers.md
  20. README.md
README.md

LLVM Linker (lld)

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.

Benchmarking

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.