Fangrui Song 0778f5c1f1 [ELF] Support NOCROSSREFS and NOCROSSERFS_TO ...

Implement the two commands described by
https://sourceware.org/binutils/docs/ld/Miscellaneous-Commands.html

After `outputSections` is available, check each output section described
by at least one `NOCROSSREFS`/`NOCROSSERFS_TO` command. For each checked
output section, scan relocations from its input sections.
This step is slow, therefore utilize `parallelForEach(isd->sections, ...)`.

To support non SHF_ALLOC sections, `InputSectionBase::relocations`
(empty) cannot be used. In addition, we may explore eliminating this
member to speed up relocation scanning.

Some parse code is adapted from #95714.

Close #41825

Pull Request: https://github.com/llvm/llvm-project/pull/98773

2024-07-17 10:45:59 -07:00

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