[llvm] [MergeFunctions] Add support to run the pass over a set of function pointers (PR #111045)

[Stephen Tozer via llvm-commits]

================
@@ -0,0 +1,271 @@
+//===- MergeFunctionsTest.cpp - Unit tests for
+// MergeFunctionsPass-----------===//
----------------
SLTozer wrote:

Nit, this should all be on one line.
```suggestion
//===- MergeFunctionsTest.cpp - Unit tests for MergeFunctionsPass ---------===//
```

https://github.com/llvm/llvm-project/pull/111045