[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:

There's also an unwritten convention in LLD to use an extra comment character for non FileCheck commands. For example:
```## If a spilling reorders ...```

It has been some time since that was started so could be worth looking at recent commits to see if it is still in operation.

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