William Moses 6a8dde04a0 [MLIR] Change getBackwardSlice to return a logicalresult rather than crash (#140961) ...

The current implementation of getBackwardSlice will crash if an
operation in the dependency chain is defined by an operation with
multiple regions or blocks. Crashing is bad (and forbids many analyses
from using getBackwardSlice, as well as causing existing users of
getBackwardSlice to fail for IR with this property).

This PR instead causes the analysis to return a failure, rather than
crash in the cases it cannot compute the full slice

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Co-authored-by: Oleksandr "Alex" Zinenko <git@ozinenko.com>

2025-05-22 14:13:32 -05:00

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