In the backward slice computation, BlockArgument coming from function arguments represent a natural boundary for the traversal and should not trigger llvm_unreachable.
This CL also improves the error message and adds a relevant test.
PiperOrigin-RevId: 260118630
This CL fixes an oversight with dealing with loops in slicing analysis.
The forward slice computation properly propagates through loops but not the backward slice.
Add relevant unit tests.
PiperOrigin-RevId: 259903396
Nicolas Vasilache