[lld] [LLD] Implement --enable-non-contiguous-regions (PR #90007)

[Peter Smith via llvm-commits]

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+# If a spilling reorders input sections, the .ARM.exidx table must be rebuilt
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smithp35 wrote:

I think you'll need a `REQUIRES arm` for the test.

https://github.com/llvm/llvm-project/pull/90007