[5.0][ConstraintSystem] Erase InOutExpr
from member base
#21222
Merged
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Diagnostics could introduce type-checked expressions into AST during
it's bottom up re-typechecking in attempt to find a problem.
To minimize number of AST permutations solver has to handle
let's just strip away implicit
InOutExpr
introduced by previoussuccessful type-checks, which is not really important anyway.
Resolves: rdar://problem/46459603
(cherry picked from commit b429d5a)