When setting a willSet/didSet param's type, also set the TypeLoc #7377
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We don't actually need the TypeLoc for anything, but it was still getting type-checked, which means it doesn't get the benefit of inference from the initial value. In some cases the actual type of the ParamDecl seems to get reset to the TypeLoc's type as well. Just do the simple thing and set it directly ahead of time.
Fixes a source compatibility issue with Swift 3.0.
SR-3893