Use std::nullopt instead of llvm::None.

llvm::None has been deprecated by bd6a170 in the LLVM mono repo.

lib/Dialect/VectorExt/IR/VectorExtOps.cpp

@@ -28,7 +28,7 @@ void mlir::vector_ext::buildTerminatedBody(OpBuilder &builder, Location loc) {
 void PredicateOp::build(OpBuilder &builder, OperationState &result,
                         Value predicateMask, ValueRange indices,
                         Value incomingMask) {
-  build(builder, result, /*resultTypes=*/llvm::None, predicateMask, indices,
+  build(builder, result, /*resultTypes=*/std::nullopt, predicateMask, indices,
         incomingMask);
 }
 
@@ -115,7 +115,7 @@ void mlir::vector_ext::PredicateOp::print(OpAsmPrinter &p) {
   p.printOptionalAttrDict(getOperation()->getAttrs());
 }
 
-/// Given the region at `index`, or the parent operation if `index` is None,
+/// Given the region at `index`, or the parent operation if `index` is nullopt,
 /// return the successor regions. These are the regions that may be selected
 /// during the flow of control. `operands` is a set of optional attributes that
 /// correspond to a constant value for each operand, or null if that operand is

lib/Dialect/VectorExt/Transform/VectorMaskingUtils.cpp

@@ -77,7 +77,7 @@ Optional<PredicateOp> mlir::vector_ext::predicateOp(
     Optional<Value> maybeIncomingMask) {
   // TODO: Support multi-block regions.
   if (!regionToPredicate->hasOneBlock())
-    return llvm::None;
+    return std::nullopt;
 
   // Compute the range of operations that will be moved within vector.predicate
   // and the definitions within the range with users outside the range.
@@ -95,7 +95,7 @@ Optional<PredicateOp> mlir::vector_ext::predicateOp(
   builder.setInsertionPointToStart(&blockToPredicate);
   Value predicateMask = createPredicateMask(builder);
   if (!predicateMask)
-    return llvm::None;
+    return std::nullopt;
 
   // Generate the vector.predicate operation and move 'opsToMove' within its
   // truePredicateRegion. We have to rewire the def-use chain for those