[llvm] [LLVM] Add HasFakeUses to MachineFunction (PR #110097)

[Jay Foad via llvm-commits]

jayfoad wrote:

If you remove the scheduler changes then that only leaves one place where the flag is tested, in `RemoveLoadsIntoFakeUses`. Are you planning to add more uses of the flag? If not, I would be tempted to abandon this patch and just accept the compile time hit of `RemoveLoadsIntoFakeUses` doing a pass over the IR.

https://github.com/llvm/llvm-project/pull/110097