[llvm] [SelectionDAG] Add m_Neg and m_Not pattern matcher and update DAGCombiner (PR #85365)

[Matt Arsenault via llvm-commits]

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@@ -174,10 +174,16 @@ TEST_F(SelectionDAGPatternMatchTest, matchUnaryOp) {
   SDValue SExt = DAG->getNode(ISD::SIGN_EXTEND, DL, Int64VT, Op0);
   SDValue Trunc = DAG->getNode(ISD::TRUNCATE, DL, Int32VT, Op1);
 
+  SDValue Neg = DAG->getNegative(Op0, DL, Int32VT);
+  SDValue Not = DAG->getNOT(DL, Op0, Int32VT);
+
   using namespace SDPatternMatch;
   EXPECT_TRUE(sd_match(ZExt, m_UnaryOp(ISD::ZERO_EXTEND, m_Value())));
   EXPECT_TRUE(sd_match(SExt, m_SExt(m_Value())));
   EXPECT_TRUE(sd_match(Trunc, m_Trunc(m_Specific(Op1))));
+
+  EXPECT_TRUE(sd_match(Neg, m_Neg(m_Value())));
+  EXPECT_TRUE(sd_match(Not, m_Not(m_Value())));
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arsenm wrote:

Maybe test some expect_false cases 

https://github.com/llvm/llvm-project/pull/85365