[llvm] Reland "[LoongArch] Add `isSafeToMove` hook to prevent unsafe instruction motion" (PR #167465)

[via llvm-commits]

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@@ -1993,6 +1994,10 @@ bool BranchFolder::HoistCommonCodeInSuccs(MachineBasicBlock *MBB) {
       // Hard to reason about register liveness with predicated instruction.
       break;
 
+    if (!TII->isSafeToMove(*TIB, TBB, MF))
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heiher wrote:

Fix: `MBB` -> `TBB`

https://github.com/llvm/llvm-project/pull/167465