[silgen] Add an extra swift-version 5 run to initializer tests. #31893
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We currently run these in swift-version 4 by default. This caused us to miss
some bugs that only occur in swift-version 5 due to initializer changes
happening in swift 5. This at least will allow us to catch such issues in the
future.
NOTE: I am also going to change objc_throwing_initializers.swift in the same
way, but after I fix the bugs that adding -swift-version 5 exposes therein
(which is actually rdar://problem/59830255)