[mlir][MemRef] Change memref-expand to be a generic operation pass

[rriddle]

Summary

This pass doesn't rely on any specific characteristics of FuncOp, and
can
just be a generic operation pass.

mlir/include/mlir/Dialect/MemRef/Transforms/Passes.td

 //===-- Passes.td - MemRef transformation definition file --*- tablegen -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef MLIR_DIALECT_MEMREF_TRANSFORMS_PASSES
 #define MLIR_DIALECT_MEMREF_TRANSFORMS_PASSES
 
 include "mlir/Pass/PassBase.td"
 
-def ExpandOps : Pass<"memref-expand", "FuncOp"> {
+def ExpandOps : Pass<"memref-expand"> {
   let summary = "Legalize memref operations to be convertible to LLVM.";
   let constructor = "mlir::memref::createExpandOpsPass()";
 }
 
 def FoldSubViewOps : Pass<"fold-memref-subview-ops"> {
   let summary = "Fold memref.subview ops into consumer load/store ops";
   let description = [{
     The pass folds loading/storing from/to subview ops to loading/storing