[lld] [ELF] Error for executable .note.GNU-stack unless -z execstack (PR #124068)

[Peter Smith via llvm-commits]

================
@@ -1026,8 +1026,15 @@ InputSectionBase *ObjFile<ELFT>::createInputSection(uint32_t idx,
     // explicitly told to do otherwise (by -z execstack). Because the stack
     // executable-ness is controlled solely by command line options,
     // .note.GNU-stack sections are simply ignored.
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smithp35 wrote:

I think we could update the comment. Something like
```
.note.GNU-stack sections are with one exception, ignored. We give an error message if we encounter an executable .note.GNU-stack to force the user to explicitly request an executable stack.
```

https://github.com/llvm/llvm-project/pull/124068