[mlir] [liveness] Conservatively mark operands of return-like op inside non-callable and non-regionbranch op as live (#140793) Currently the liveness analysis always marks operands yielded in regions that aren't classified as `RegionBranchOpInterface` or `CallableOpInterface` as non-live. Examples for these ops include linalg.generic (with `linalg.yield` as terminator) or gpu ops (with `gpu.yield` as terminator). This in turn makes the `remove-dead-values` pass always incorrectly remove the bodies of these ops, leading to invalid IR. Because these ops define their own semantics, I have conservatively marked all operands of these yield ops to be live.
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