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0507d51f0c
On a Postgres snapshot, where the `getAReachedBlockVarSBB` predicate
performs badly because of a Yacc-generated 20,000-line parser loop, that
predicate is reduced from 4m22s to 1m32s plus 5.2s for the live
variables analysis.
This change removes 17,142 rows from `BlockVar.getAnAccess` on Postgres.
I sampled some of them, and they were all of the following form:
while (...) {
T x;
f1(&x); // access
f2(&x); // definition
}
Such accesses are ruled out now because we deliberately lose track of
variables when they go out of scope.