[MLIR][OneShotBufferize] Fix opFilter init (#130633)

OneShotBufferizePass's opFilter definition in runOnOperation() fails to
allow operations for all dialect when the dialectFilter has an empty
array value (as opposed to no value). This happens when constructing
OneShotBufferizePass from a OneShotBufferizePassOptions parameter with
an empty dialectFilter. This commit only does filtering if filterDialect
option has a value and it is not an empty array.

Author: RoboTux

mlir/lib/Dialect/Bufferization/Transforms/Bufferize.cpp

@@ -142,7 +142,7 @@ struct OneShotBufferizePass
       // Configure op filter.
       OpFilter::Entry::FilterFn filterFn = [&](Operation *op) {
         // Filter may be specified via options.
-        if (this->dialectFilter.hasValue())
+        if (this->dialectFilter.hasValue() && !(*this->dialectFilter).empty())
           return llvm::is_contained(this->dialectFilter,
                                     op->getDialect()->getNamespace());
         // No filter specified: All other ops are allowed.