Rollup merge of #129418 - petrochenkov:libsearch2, r=jieyouxu

rustc: Simplify getting sysroot library directory

It was very non-obvious that `sess.target_tlib_path`, `make_target_lib_path(...)`, and `sess.target_filesearch(...).search_paths()` result in the same sysroot library directory paths.
They are however, indeed the same, because `sess.target_tlib_path` is initialized to `make_target_lib_path(...)` on `Session` creation, and they are used interchangeably.

There are still some redundant calls to `make_target_lib_path` and other inconsistent ways to obtain sysroot directories, but fixing that requires some behavior changes, while this PR is a pure refactoring.
Some places in the compiler even disagree on the number of sysroots - 1 (explicit `--sysroot` *or* default sysroot), 2 (explicit `--sysroot` *and* default sysroot), or an unclear number of `sysroot_candidates` every of which is considered.
The logic currently using `sess.target_tlib_path` or equivalents assumes one sysroot.
tree: f41cd88648f2dd3f297385d15a90a806e6925413
  1. .github/
  2. compiler/
  3. library/
  4. LICENSES/
  5. src/
  6. tests/
  7. .clang-format
  8. .editorconfig
  9. .git-blame-ignore-revs
  10. .gitattributes
  11. .gitignore
  12. .gitmodules
  13. .ignore
  14. .mailmap
  15. Cargo.lock
  16. Cargo.toml
  17. CODE_OF_CONDUCT.md
  18. config.example.toml
  19. configure
  20. CONTRIBUTING.md
  21. COPYRIGHT
  22. INSTALL.md
  23. LICENSE-APACHE
  24. LICENSE-MIT
  25. README.md
  26. RELEASES.md
  27. REUSE.toml
  28. rust-bors.toml
  29. rustfmt.toml
  30. triagebot.toml
  31. x
  32. x.ps1
  33. x.py
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