[mlir][linalg] Cleanup LinalgOp usage in capi.

[gysit]

Summary

Replace the uses of deprecated Structured Op Interface methods in Linalg.cpp. This patch is based on https://reviews.llvm.org/D103394.

mlir/lib/CAPI/Dialect/Linalg.cpp

LinalgDialect::RegionBuilderFunType fun =
           ->getRegionBuilder(op->getName().getStringRef());
   assert(fun && "Expected a builtin named Linalg op.");
   assert(op->getNumRegions() == 1 && "Expected Linalg op with 1 region");
   assert(op->getRegion(0).getBlocks().empty() &&
          "Expected Linalg op with 0 blocks");
 
   SmallVector<Type, 8> argTypes;
   auto linalgOp = cast<LinalgOp>(op);
-  for (auto t : linalgOp.getShapedOperandTypes())
-    argTypes.push_back(getElementTypeOrSelf(t));
+  for (OpOperand *opOperand : linalgOp.getInputAndOutputOperands())
+    argTypes.push_back(getElementTypeOrSelf(opOperand->get().getType()));
 
   ImplicitLocOpBuilder b(op->getLoc(), op->getContext());
   Region &region = op->getRegion(0);
   Block *body = b.createBlock(&region, /*insertPt=*/{}, argTypes);
   b.setInsertionPointToStart(body);
   fun(b, *body, captures);
 }
 
 MLIR_DEFINE_CAPI_DIALECT_REGISTRATION(Linalg, linalg, LinalgDialect)