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

[Amir Ayupov via llvm-commits]

================
@@ -0,0 +1,98 @@
+## Check that BOLT handles correctly folding functions with --icf=safe that can be referenced by non-control flow instructions.
+## It invokes BOLT twice first testing CFG path, and second when functions have to be disassembled.
+
+# REQUIRES: system-linux
----------------
aaupov wrote:

```suggestion
# REQUIRES: system-linux, asserts
```
`-debug` requires `asserts` build

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