[Mlir-commits] [mlir] [mlir][IR] Mark `getParentBlock()` and `getParentRegion()` as const (NFC) (PR #151915)

[Longsheng Mou]

CoTinker wrote:

The reason behind this change is that `Value::getParentOp()` is already const, and since `ValueComparator::operator()` takes const Values, it makes sense for `getParentBlock()` and `getParentRegion()` to be const as well.
https://github.com/llvm/llvm-project/blob/19803d824971826fb6961059cce160da2094ab6b/mlir/lib/Dialect/Bufferization/IR/BufferDeallocationOpInterface.cpp#L222

https://github.com/llvm/llvm-project/pull/151915