[CSGen] Allow is patterns to infer type from enclosing context
#32159
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Instead of assuming type of its sub-pattern `is` should be able to infer type from context and then propagate that to the sub-pattern via conversion. This enables support for patterns like `.foo(_ as Foo)` where `is` would have a type different from `_` which gets inferred from associated value of `foo` and converted to `Foo` that becomes a type of `_` pattern. Resolves: rdar://problem/63510989
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Instead of assuming type of its sub-pattern
isshould be ableto infer type from context and then propagate that to the sub-pattern
via conversion. This enables support for patterns like
.foo(_ as Foo)where
iswould have a type different from_which gets inferredfrom associated value of
fooand converted toFoothat becomesa type of
_pattern.Resolves: rdar://problem/63510989