cross-module-optimization: don't make imported type declarations usable-from-inline.
cross-module-optimization: don't make imported type declarations usable-from-inline.

Fixes unresolved-symbol linker errors.

rdar://87930768

glessard/swift,JGiola/swift,gregomni/swift,JGiola/swift,roambotics/swift,ahoppen/swift,benlangmuir/swift,atrick/swift,JGiola/swift,roambotics/swift,ahoppen/swift,benlangmuir/swift,glessard/swift,gregomni/swift,apple/swift,apple/swift,benlangmuir/swift,atrick/swift,benlangmuir/swift,atrick/swift,gregomni/swift,ahoppen/swift,ahoppen/swift,rudkx/swift,roambotics/swift,atrick/swift,apple/swift,glessard/swift,ahoppen/swift,glessard/swift,gregomni/swift,apple/swift,rudkx/swift,atrick/swift,glessard/swift,rudkx/swift,gregomni/swift,ahoppen/swift,rudkx/swift,atrick/swift,rudkx/swift,apple/swift,glessard/swift,apple/swift,JGiola/swift,roambotics/swift,JGiola/swift,roambotics/swift,gregomni/swift,JGiola/swift,benlangmuir/swift,benlangmuir/swift,rudkx/swift,roambotics/swift