[4.2] [SILGen] Ensure type params in witness method conformances match the witness method signatures. #16514
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…witness method signatures. A witness method of a class can have its generic parameters rephrased: a parameters of the class, like τ_0_0, get pushed to the next depth, like τ_1_0, to make way for a τ_0_0 parameter with a τ_0_0: Class<...> subclass constraint. When this wasn't accounted for, IRGen would find that it couldn't satisfy conditional requirements on the rewritten type parameters, and they'd incorrectly be passed as additional arguments of a witness method thunk rather than pulled out of the Self witness table's private area inside the thunk. Fixes rdar://problem/40078863.
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A witness method of a class can have its generic parameters rephrased: a
parameters of the class, like τ_0_0, get pushed to the next depth, like τ_1_0,
to make way for a τ_0_0 parameter with a τ_0_0: Class<...> subclass
constraint. When this wasn't accounted for, IRGen would find that it couldn't
satisfy conditional requirements on the rewritten type parameters, and they'd
incorrectly be passed as additional arguments of a witness method thunk rather
than pulled out of the Self witness table's private area inside the thunk.
Fixes rdar://problem/40078863.