[pull] master from tensorflow:master - #8793
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PiperOrigin-RevId: 973246125
Previously, ConstraintPropagator only analyzed computations in isolation and stopped at kFusion instructions. In multi-level fusions (such as kOutput fusions containing inner kLoop fusions), constraints from internal operations failed to propagate backward to the module's entry parameters. Consequently, parameters remained at their default unconstrained ranges causing floating-point overflow to +inf and downstream NaN generation. This change: - Implements PropagateFusionBoundary in PropagateConstraintsExact to bidirectionally synchronize caller operands with callee fused parameters, and caller results with the fused expression root. - Updates ConstraintPropagator::Run to perform an inter-procedural fixed-point iteration across all computations in topological post-order until global convergence. - Adds unit tests verifying constraint propagation across both single-level and multi-level nested fusions. PiperOrigin-RevId: 973306649
PiperOrigin-RevId: 973308466
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