[llvm] [DAG] isKnownNeverZero - add ISD::UDIV/SDIV DemandedElts handling and tests (PR #183227)

[Matt Arsenault via llvm-commits]

================
@@ -1519,4 +1519,97 @@ TEST_F(AArch64SelectionDAGTest, KnownNeverZero_Select) {
   EXPECT_FALSE(DAG->isKnownNeverZero(VSelect444Big, DemandAll));
   EXPECT_TRUE(DAG->isKnownNeverZero(VSelect4444, DemandAll));
 }
+
+TEST_F(AArch64SelectionDAGTest, KnownNeverZero_Div) {
+  SDLoc Loc;
+  auto Cst0 = DAG->getConstant(0, Loc, MVT::i32);
----------------
arsenm wrote:

No auto and lit test is better 

https://github.com/llvm/llvm-project/pull/183227