[llvm] [llvm-objcopy,ELF] --discard-locals/--discad-all: allow and keep symbols referenced by relocations (PR #130704)

[James Henderson via llvm-commits]

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@@ -160,6 +160,7 @@ Changes to the LLVM tools
 
 * llvm-objcopy now supports the `--update-section` flag for intermediate Mach-O object files.
 * llvm-strip now supports continuing to process files on encountering an error.
+* In llvm-objcopy's ELF port, `--discard-locals` and `--discard-all` now allow and preserve symbols references by relocations.
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jh7370 wrote:

```suggestion
* In llvm-objcopy's ELF port, `--discard-locals` and `--discard-all` now allow and preserve symbols referenced by relocations.
```

https://github.com/llvm/llvm-project/pull/130704