[ConstraintElimination] Add support for And.

llvm/lib/Transforms/Scalar/ConstraintElimination.cpp

if (match(Br->getCondition(), m_Or(m_Cmp(), m_Cmp()))) {
         WorkList.emplace_back(DT.getNode(Br->getSuccessor(1)),
                               cast<CmpInst>(OrI->getOperand(0)), true);
         WorkList.emplace_back(DT.getNode(Br->getSuccessor(1)),
                               cast<CmpInst>(OrI->getOperand(1)), true);
       }
       continue;
     }
 
+    if (match(Br->getCondition(), m_And(m_Cmp(), m_Cmp()))) {
+      if (Br->getSuccessor(0)->getSinglePredecessor()) {
+        auto *OrI = cast<Instruction>(Br->getCondition());
+        WorkList.emplace_back(DT.getNode(Br->getSuccessor(0)),
+                              cast<CmpInst>(OrI->getOperand(0)), false);
+        WorkList.emplace_back(DT.getNode(Br->getSuccessor(0)),
+                              cast<CmpInst>(OrI->getOperand(1)), false);
+      }
+      continue;
+    }
+
     auto *CmpI = dyn_cast<CmpInst>(Br->getCondition());
     if (!CmpI)
       continue;
     if (Br->getSuccessor(0)->getSinglePredecessor())
       WorkList.emplace_back(DT.getNode(Br->getSuccessor(0)), CmpI, false);
     if (Br->getSuccessor(1)->getSinglePredecessor())
       WorkList.emplace_back(DT.getNode(Br->getSuccessor(1)), CmpI, true);
   }

llvm/test/Transforms/ConstraintElimination/and.ll

 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt -constraint-elimination -S %s | FileCheck %s
 
 declare void @use(i1)
 
 define i32 @test_and_ule(i32 %x, i32 %y, i32 %z, i32 %a) {
 ; CHECK-LABEL: @test_and_ule(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[C_1:%.*]] = icmp ule i32 [[X:%.*]], [[Y:%.*]]
 ; CHECK-NEXT:    [[C_2:%.*]] = icmp ule i32 [[Y]], [[Z:%.*]]
 ; CHECK-NEXT:    [[AND:%.*]] = and i1 [[C_1]], [[C_2]]
 ; CHECK-NEXT:    br i1 [[AND]], label [[BB1:%.*]], label [[EXIT:%.*]]
 ; CHECK:       bb1:
 ; CHECK-NEXT:    [[T_1:%.*]] = icmp ule i32 [[X]], [[Z]]
-; CHECK-NEXT:    call void @use(i1 [[T_1]])
+; CHECK-NEXT:    call void @use(i1 true)
 ; CHECK-NEXT:    [[T_2:%.*]] = icmp ule i32 [[X]], [[Y]]
-; CHECK-NEXT:    call void @use(i1 [[T_2]])
+; CHECK-NEXT:    call void @use(i1 true)
 ; CHECK-NEXT:    [[T_3:%.*]] = icmp ule i32 [[Y]], [[Z]]
-; CHECK-NEXT:    call void @use(i1 [[T_3]])
+; CHECK-NEXT:    call void @use(i1 true)
 ; CHECK-NEXT:    [[C_3:%.*]] = icmp ule i32 [[X]], [[A:%.*]]
 ; CHECK-NEXT:    call void @use(i1 [[C_3]])
 ; CHECK-NEXT:    ret i32 10
 ; CHECK:       exit:
 ; CHECK-NEXT:    [[C_4:%.*]] = icmp ule i32 [[X]], [[Z]]
 ; CHECK-NEXT:    call void @use(i1 [[C_4]])
 ; CHECK-NEXT:    [[C_5:%.*]] = icmp ule i32 [[X]], [[A]]
 ; CHECK-NEXT:    call void @use(i1 [[C_5]])