[CodeGen][NewPM] Preserve all MF analyses in MFPM (#124707)

Invalidation is already handled in the passes loop for MFAM, so all of
the rest analyses are preserved. (See `PassManager::run()`)

This won't change the number of invalidations, but will prevent needless
`MFAM::Invalidator::invalidate()` invocations made by results depending
on other results (since the invalidate shorts if `<AllAnalysesOn<MF>>`
is preserved)

Author: optimisan

llvm/lib/CodeGen/MachinePassManager.cpp

@@ -152,6 +152,7 @@ PassManager<MachineFunction>::run(MachineFunction &MF,
     PI.runAfterPass(*Pass, MF, PassPA);
     PA.intersect(std::move(PassPA));
   }
+  PA.preserveSet<AllAnalysesOn<MachineFunction>>();
   return PA;
 }