FEXCore/IR: Fixes bug in IRDumper without specification

Didn't notice this in the previous PR, When DUMPIR=stderr without and
selection of where to place it in PASSMANAGERDUMPIR it was supposed to
put the dumper at the end of the passes.

We need to make sure that it it placed at the end of the passes rather
than current `it`.

External/FEXCore/Source/Interface/IR/PassManager.cpp

@@ -60,7 +60,7 @@ void PassManager::Finalize() {
   if (PassManagerDumpIR() & FEXCore::Config::PassManagerDumpIR::AFTEROPT) {
     if (!(PassManagerDumpIR() & FEXCore::Config::PassManagerDumpIR::AFTERPASS)) {
       // Insert final IRDumper.
-      it = InsertAt(it, Debug::CreateIRDumper());
+      InsertAt(Passes.end(), Debug::CreateIRDumper());
     }
   }
 }