[llvm] [Mips] Fix mfhi/mflo hazard miscompilation about div and mult (PR #91449)

[YunQiang Su via llvm-commits]

================
@@ -766,17 +769,40 @@ bool MipsBranchExpansion::handleSlot(Pred Predicate, Safe SafeInSlot) {
         if (std::next(Iit) == FI->end() ||
             std::next(Iit)->getOpcode() != Mips::NOP) {
           Changed = true;
-          TII->insertNop(*(I->getParent()), std::next(I), I->getDebugLoc())
-              ->bundleWithPred();
-          NumInsertedNops++;
+          if (Predicate(*I) ||
----------------
wzssyqa wrote:

Why this condition is added here?
I guess you need some comment or description in commit msg.

https://github.com/llvm/llvm-project/pull/91449