Prevent crash with `-playground` when `-experimental-skip-non-inlinable-function-bodies-without-types` also passed (#71171)
Skip playground transform for functions that have skipped bodies. This can happen when passing `-emit-module` and `-experimental-skip-non-inlinable-function-bodies-without-types` and also enabling the playground transform. This causes the type to be `nullptr`. The fix is for the playground transform to check `AbstractFunctionDecl::isBodySkipped()`.
rdar://119258854