[typelowering] Use the RawASTType when looking up TypeLowerings.

This ensures that trivial moveonlywrapped values are not treated as trivial thus
enabling us to track ownership for them.

Author: gottesmm

lib/SIL/IR/TypeLowering.cpp

@@ -2558,7 +2558,11 @@ TypeConverter::getTypeLowering(SILType type,
                                CanGenericSignature sig) {
   // The type lowering for a type parameter relies on its context.
   assert(sig || !type.getASTType()->hasTypeParameter());
-  auto loweredType = type.getASTType();
+
+  // We use the Raw AST type to ensure that moveonlywrapped values use the move
+  // only type lowering. This ensures that trivial moveonlywrapped values are
+  // not trivial.
+  auto loweredType = type.getRawASTType();
   auto isTypeExpansionSensitive = loweredType->hasOpaqueArchetype()
                                       ? IsTypeExpansionSensitive
                                       : IsNotTypeExpansionSensitive;