[mlir] Mark `isa/dyn_cast/cast/...` member functions deprecated. (#89998)
See https://mlir.llvm.org/deprecation and https://discourse.llvm.org/t/preferred-casting-style-going-forward.
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See https://mlir.llvm.org/deprecation and https://discourse.llvm.org/t/preferred-casting-style-going-forward.
mentioned in commit 7aedd7dc
·mentioned in commit 7aedd7dc