[mlir][bufferization] Introduce reconcileBufferTypeMismatchFn hook (#202667) This PR is the first part of the work that aims to allow customizations in resolving mismatching buffer types. Add a new bufferization hook that lets downstream bufferization implementations define how to handle buffer mismatches that appear during type inference in various upstream scenarios. The hook is used as a fallback mechanism in several upstream operations. For example, when bufferizing block signatures (scf.execute_region), and resolving "branch" conflicts (scf.if, scfl.index_switch, scf.for, arith.select). The hook returns a valid buffer type when reconciliation succeeded; failure indicates reconciliation failure and should be treated as bufferization failure. The caller of the hook is expected to use the returned buffer type. By default, a memref with fully-dynamic layout map is returned (for unranked case, buffers are assumed to match). --------- Co-authored-by: Dmitrii Makarenko <dmitrii.makarenko@intel.com>
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