[ConstraintSystem] Use the type cache to read types in constraint gen… #17536
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…eration. We should pretty much always be reading expression types out of the type cache in the constraint system. We only see key path applications here on the path where we are diagnosing a failure. I haven't yet managed to come up with a test case that reproduces a crash here. Fixes: rdar://problem/41306933
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…eration.
We should pretty much always be reading
expression types out of the type cache in the constraint system.
We only see key path applications here on the path where we are
diagnosing a failure.
I haven't yet managed to come up with a test case that reproduces a crash
here.
Fixes: rdar://problem/41306933