LifetimeDependence type checking: avoid an assertion on error.

When the type checker encounters incomplete type error, bail out early to avoid
an assertion.

Author: atrick

lib/AST/LifetimeDependence.cpp

@@ -954,7 +954,7 @@ class LifetimeDependenceChecker {
       Type paramTypeInContext =
         afd->mapTypeIntoContext(param->getInterfaceType());
       if (paramTypeInContext->hasError()) {
-        continue;
+        return;
       }
       auto kind = inferLifetimeDependenceKind(paramTypeInContext,
                                               param->getValueOwnership());