[llvm] [BOLT] Add support for safe-icf (PR #116275)

[Amir Ayupov via llvm-commits]

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@@ -0,0 +1,66 @@
+## Check that BOLT handles correctly folding functions with --icf=safe that are only reference in a .rela.data section.
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aaupov wrote:

```suggestion
## Check that BOLT handles correctly folding functions with --icf=safe that are only referenced from a .rela.data section.
```

https://github.com/llvm/llvm-project/pull/116275