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

[Maksim Panchenko via llvm-commits]

================
@@ -0,0 +1,238 @@
+## Check that BOLT handles correctly folding functions with --icf=safe that can be referenced.
----------------
maksfb wrote:

That can be referenced from where?

This test case is too large.

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