[shape] Add inferReturnTypes to a couple ops.

[silvas]

Summary

• ShapeOfOp
• BroadcastOp

Depends On D78821

mlir/include/mlir/Dialect/Shape/IR/ShapeOps.td

let description = [{
     * lhs + rhs = unknown if either lhs or rhs unknown;
     * lhs + rhs = (int)lhs + (int)rhs if known;
   }];
 
   let arguments = (ins Shape_SizeType:$lhs, Shape_SizeType:$rhs);
   let results = (outs Shape_SizeType:$result);
 }
 
-def Shape_BroadcastOp : Shape_Op<"broadcast", []> {
+def Shape_BroadcastOp : Shape_Op<"broadcast",
+    [DeclareOpInterfaceMethods<InferTypeOpInterface>]> {
   let summary = "Returns the broadcasted output shape of two inputs";
   let description = [{
     Computes the broadcasted output shape following:
     1. If any inputs are unranked, output is unranked;
     2. Else the input array with number of dimensions smaller than the max
        input dimension, has 1’s prepended to its shapes and the output shape is
        calculated as follows:
 
def Shape_ReduceOp : Shape_Op<"reduce", []> {
   }];
 
   let arguments = (ins Shape_ShapeType:$shape, Variadic<AnyType>:$args);
   let results = (outs Variadic<AnyType>:$result);
 
   let regions = (region SizedRegion<1>:$body);
 }
 
-def Shape_ShapeOfOp : Shape_Op<"shape_of", []> {
+def Shape_ShapeOfOp : Shape_Op<"shape_of",
+    [DeclareOpInterfaceMethods<InferTypeOpInterface>]> {
   let summary = "Returns shape of a value or shaped type operand";
 
   let arguments = (ins AnyTypeOf<[AnyShaped, Shape_ValueShapeType]>:$arg);
   let results = (outs Shape_ShapeType:$result);
 
   let hasFolder = 1;
 }
 

mlir/lib/Dialect/Shape/IR/Shape.cpp

default:
     llvm_unreachable("unexpected 'shape' type kind");
   }
 }
 
 //===----------------------------------------------------------------------===//
 // ShapeOfOp
 //===----------------------------------------------------------------------===//
 
+LogicalResult ShapeOfOp::inferReturnTypes(
+    MLIRContext *context, Optional<Location> location, ValueRange operands,
+    ArrayRef<NamedAttribute> attributes, RegionRange regions,
+    SmallVectorImpl<Type> &inferredReturnTypes) {
+  inferredReturnTypes.push_back(ShapeType::get(context));
+  return success();
+}
+
 OpFoldResult ShapeOfOp::fold(ArrayRef<Attribute>) {
   auto type = getOperand().getType().cast<ShapedType>();
   if (!type.hasStaticShape())
     return nullptr;
   Builder builder(getContext());
   return builder.getI64TensorAttr(type.getShape());
 }
 
 //===----------------------------------------------------------------------===//
 // BroadcastOp
 //===----------------------------------------------------------------------===//
 
+LogicalResult BroadcastOp::inferReturnTypes(
+    MLIRContext *context, Optional<Location> location, ValueRange operands,
+    ArrayRef<NamedAttribute> attributes, RegionRange regions,
+    SmallVectorImpl<Type> &inferredReturnTypes) {
+  inferredReturnTypes.push_back(ShapeType::get(context));
+  return success();
+}
+
 OpFoldResult BroadcastOp::fold(ArrayRef<Attribute> operands) {
   if (!operands[0] || !operands[1])
     return nullptr;
   auto lhsShape = llvm::to_vector<6>(
       operands[0].cast<DenseIntElementsAttr>().getValues<int64_t>());
   auto rhsShape = llvm::to_vector<6>(
       operands[1].cast<DenseIntElementsAttr>().getValues<int64_t>());
   SmallVector<int64_t, 6> resultShape;