[mlir] Simplify unreachable type switch cases. NFC.

Use `DefaultUnreachable` from llvm#161970.

Author: kuhar

mlir/lib/Conversion/PDLToPDLInterp/PredicateTree.cpp

@@ -243,7 +243,7 @@ static void getTreePredicates(std::vector<PositionalPredicate> &predList,
       .Case<OperandPosition, OperandGroupPosition>([&](auto *pos) {
         getOperandTreePredicates(predList, val, builder, inputs, pos);
       })
-      .Default([](auto *) { llvm_unreachable("unexpected position kind"); });
+      .DefaultUnreachable("unexpected position kind");
 }
 
 static void getAttributePredicates(pdl::AttributeOp op,

mlir/lib/Dialect/ArmSME/Transforms/OuterProductFusion.cpp

@@ -170,7 +170,7 @@ class OuterProductFusion2Way
                 op2, op.getResultType(), lhs, rhs, lhsMask, rhsMask,
                 op1.getAcc());
           })
-          .Default([&](auto) { llvm_unreachable("unexpected extend op!"); });
+          .DefaultUnreachable("unexpected extend op!");
     } else if (kind == arm_sme::CombiningKind::Sub) {
       TypeSwitch<Operation *>(extOp)
           .Case<arith::ExtFOp>([&](auto) {
@@ -188,7 +188,7 @@ class OuterProductFusion2Way
                 op2, op.getResultType(), lhs, rhs, lhsMask, rhsMask,
                 op1.getAcc());
           })
-          .Default([&](auto) { llvm_unreachable("unexpected extend op!"); });
+          .DefaultUnreachable("unexpected extend op!");
     } else {
       llvm_unreachable("unexpected arm_sme::CombiningKind!");
     }

mlir/lib/Dialect/GPU/IR/GPUDialect.cpp

@@ -375,7 +375,7 @@ void GPUDialect::printType(Type type, DialectAsmPrinter &os) const {
         os << shape.back() << 'x' << fragTy.getElementType();
         os << ", \"" << fragTy.getOperand() << "\"" << '>';
       })
-      .Default([](Type) { llvm_unreachable("unexpected 'gpu' type kind"); });
+      .DefaultUnreachable("unexpected 'gpu' type kind");
 }
 
 static LogicalResult verifyKnownLaunchSizeAttr(Operation *op,

mlir/lib/Dialect/Linalg/Transforms/Loops.cpp

@@ -192,7 +192,7 @@ static void replaceIndexOpsByInductionVariables(RewriterBase &rewriter,
         .Case([&](affine::AffineForOp affineForOp) {
           allIvs.push_back(affineForOp.getInductionVar());
         })
-        .Default([&](Operation *op) { assert(false && "unexpected op"); });
+        .DefaultUnreachable("unexpected op");
   }
   assert(linalgOp.getNumLoops() == allIvs.size() &&
          "expected the number of loops and induction variables to match");

mlir/lib/Dialect/MemRef/Transforms/FoldMemRefAliasOps.cpp

@@ -315,7 +315,7 @@ LogicalResult LoadOpOfSubViewOpFolder<OpTy>::matchAndRewrite(
             op, op.getType(), subViewOp.getSource(), sourceIndices,
             op.getTranspose(), op.getNumTiles());
       })
-      .Default([](Operation *) { llvm_unreachable("unexpected operation."); });
+      .DefaultUnreachable("unexpected operation");
   return success();
 }
 
@@ -367,7 +367,7 @@ LogicalResult LoadOpOfExpandShapeOpFolder<OpTy>::matchAndRewrite(
             op, op.getType(), expandShapeOp.getViewSource(), sourceIndices,
             op.getMask(), op.getPassThru());
       })
-      .Default([](Operation *) { llvm_unreachable("unexpected operation."); });
+      .DefaultUnreachable("unexpected operation");
   return success();
 }
 
@@ -415,7 +415,7 @@ LogicalResult LoadOpOfCollapseShapeOpFolder<OpTy>::matchAndRewrite(
             op, op.getType(), collapseShapeOp.getViewSource(), sourceIndices,
             op.getMask(), op.getPassThru());
       })
-      .Default([](Operation *) { llvm_unreachable("unexpected operation."); });
+      .DefaultUnreachable("unexpected operation");
   return success();
 }
 
@@ -482,7 +482,7 @@ LogicalResult StoreOpOfSubViewOpFolder<OpTy>::matchAndRewrite(
             op, op.getSrc(), subViewOp.getSource(), sourceIndices,
             op.getLeadDimension(), op.getTransposeAttr());
       })
-      .Default([](Operation *) { llvm_unreachable("unexpected operation."); });
+      .DefaultUnreachable("unexpected operation");
   return success();
 }
 
@@ -535,7 +535,7 @@ LogicalResult StoreOpOfExpandShapeOpFolder<OpTy>::matchAndRewrite(
             op, expandShapeOp.getViewSource(), sourceIndices, op.getMask(),
             op.getValueToStore());
       })
-      .Default([](Operation *) { llvm_unreachable("unexpected operation."); });
+      .DefaultUnreachable("unexpected operation");
   return success();
 }
 
@@ -584,7 +584,7 @@ LogicalResult StoreOpOfCollapseShapeOpFolder<OpTy>::matchAndRewrite(
             op, collapseShapeOp.getViewSource(), sourceIndices, op.getMask(),
             op.getValueToStore());
       })
-      .Default([](Operation *) { llvm_unreachable("unexpected operation."); });
+      .DefaultUnreachable("unexpected operation");
   return success();
 }
 

mlir/lib/Tools/PDLL/AST/NodePrinter.cpp

@@ -154,7 +154,7 @@ void NodePrinter::print(Type type) {
       })
       .Case([&](TypeType) { os << "Type"; })
       .Case([&](ValueType) { os << "Value"; })
-      .Default([](Type) { llvm_unreachable("unknown AST type"); });
+      .DefaultUnreachable("unknown AST type");
 }
 
 void NodePrinter::print(const Node *node) {
@@ -182,7 +182,7 @@ void NodePrinter::print(const Node *node) {
           const VariableDecl,
 
           const Module>([&](auto derivedNode) { this->printImpl(derivedNode); })
-      .Default([](const Node *) { llvm_unreachable("unknown AST node"); });
+      .DefaultUnreachable("unknown AST node");
   elementIndentStack.pop_back();
 }
 

mlir/lib/Tools/PDLL/AST/Nodes.cpp

@@ -72,7 +72,7 @@ class NodeVisitor {
 
             const Module>(
             [&](auto derivedNode) { this->visitImpl(derivedNode); })
-        .Default([](const Node *) { llvm_unreachable("unknown AST node"); });
+        .DefaultUnreachable("unknown AST node");
   }
 
 private: