Simon Pilgrim d92ce344bf Revert faecc736e2 #74443 [DAG] isSplatValue - node is a splat if all demanded elts have the same whole constant value (#74443) ...

Relying on ComputeKnownBits to find a splat is causing miscompilations where a shift of zero is being assumed to give zero, but further simplification leads to a shift of zero by undef, resulting in an unexpected undef value.

Fixes #78109

2024-01-17 15:59:33 +00:00

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