[TableGen] Fix null-pointer assert in RecordVal::setValue on failed cast (#195492) When setValue's getCastTo failed, Value was overwritten with nullptr instead of being left untouched. The "no value set" sentinel is UnsetInit, not nullptr, so a downstream RecordResolver::resolve that called isa<UnsetInit>(RV->getValue()) would assert on the null pointer when a later def tried to resolve an expression referring to that field. Compute the cast into a local and only commit to Value on success, so a type-incompatible override (e.g. redeclaring an int field as string in a subclass) reports the existing "is incompatible" error and exits cleanly instead of aborting. Fixes issue : https://github.com/llvm/llvm-project/issues/184879 Assisted by Claude.
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