llvm-project

858d1dfa - [DAG] visitTRUNCATE - early out from computeKnownBits/ComputeNumSignBits failures. NFC. (#154111)

[DAG] visitTRUNCATE - early out from computeKnownBits/ComputeNumSignBits failures. NFC. (#154111) Avoid unnecessary (costly) computeKnownBits/ComputeNumSignBits calls - use MaskedValueIsZero instead of computeKnownBits directly to simplify code.