nilness: bound generated state machine analysis#1728
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Dense nilness dataflow can spend more than 263 seconds analyzing a single generated go-json state machine. Return the existing conservative unknown-result facts only for generated functions with more than 1,000 IR blocks; leave handwritten functions and smaller generated functions unchanged. Construct the oversized generated state machine in a focused test instead of committing a large fixture.
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Dense nilness dataflow can spend more than 263 seconds analyzing one generated go-json encoder, even after the source carries the standard generated-file marker. The observed case was the vm_color_indent nogo action in a focused downstream build; the full invocation was interrupted after 286 seconds.
For functions with more than 1,000 IR blocks, check that the function belongs to a generated file before using the existing conservative unknown-return bailout. All handwritten functions and smaller generated functions retain their current nilness analysis. The new focused regression test constructs the large generated state machine at runtime instead of committing a large fixture.
This is intentionally separate from the recover fix in #1726.