[llvm] [AMDGPU][FixIrreducible][UnifyLoopExits] Support callbr with inline-asm (PR #149308)

[Robert Imschweiler via llvm-commits]

================
@@ -325,7 +402,7 @@ static bool FixIrreducibleImpl(Function &F, CycleInfo &CI, DominatorTree &DT,
   LLVM_DEBUG(dbgs() << "===== Fix irreducible control-flow in function: "
                     << F.getName() << "\n");
 
-  assert(hasOnlySimpleTerminator(F) && "Unsupported block terminator.");
+  assert(hasOnlySimpleTerminatorOrCallBr(F) && "Unsupported block terminator.");
----------------
ro-i wrote:

Only if those blocks are processed while dealing with a loop/cycle.
However, they wouldn't actually be a problem if used completely unrelated to any loop/cycle.
Ig that it's more for documenting the restriction of the pass inside the code as well.

https://github.com/llvm/llvm-project/pull/149308