[mlir] Dialect Conversion: Add support for post-order legalization order (#166292) By default, the dialect conversion driver processes operations in pre-order: the initial worklist is populated pre-order. (New/modified operations are immediately legalized recursively.) This commit adds a new API for selective post-order legalization. Patterns can request an operation / region legalization via `ConversionPatternRewriter::legalize`. They can call these helper functions on nested regions before rewriting the operation itself. Note: In rollback mode, a failed recursive legalization typically leads to a conversion failure. Since recursive legalization is performed by separate pattern applications, there is no way for the original pattern to recover from such a failure.
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