Fixed bug in buffer deallocation pass using unranked memref types.

In the buffer deallocation pass, unranked memref types are not properly supported.
After investigating this issue, it turns out that the Clone and Dealloc operation
does not support unranked memref types in the current implementation.
This patch adds the missing feature and enables the transformation of any memref
type.

This patch solves this bug: https://bugs.llvm.org/show_bug.cgi?id=48385

Differential Revision: https://reviews.llvm.org/D101760