[TableGen] Short-circuit !cond operator (#208942)
Fixes #163213
TableGen `!cond` operator currently resolves all subsequent conditions
and values even if it already found a condition that resolves to `true`.
This change short-circuits on the first `true` resolution found
iterating from left to right. It folds a new `CondOpInit` with only the
conditions and values that have already been resolved, including the
current condition and value.
