[lld] [LLD][COFF] Always locate the IAT at the beginning of the .rdata section and align its size to 4KB on ARM64EC. (PR #107588)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo approved this pull request.

LGTM, thanks!

I had browsed the previous version of this patch in your branch before, but the version you're submitting here is slightly different - can you elaborate on where you moved it, what implications it has (previously I think you only added one set of chunks somewhere, but now you're adding things to `contribSections` too) and why you changed your approach?

(I guess normally one doesn't have to answer about code changes prior to submission, but I somewhat felt that the previous version that I've seen felt more straightforward, but I guess this one is more complete/correct somehow?)

https://github.com/llvm/llvm-project/pull/107588