Use configurations and declared variables to select import/export URIs during prelinking.

pkg/analyzer_cli/lib/src/build_mode.dart

Index: pkg/analyzer_cli/lib/src/build_mode.dart
diff --git a/pkg/analyzer_cli/lib/src/build_mode.dart b/pkg/analyzer_cli/lib/src/build_mode.dart
index 7632e692bceb5fe6a640323cb453e0df3506b89b..af1dbcc963b4ff57ab32af46850fd44f843b9101 100644
--- a/pkg/analyzer_cli/lib/src/build_mode.dart
+++ b/pkg/analyzer_cli/lib/src/build_mode.dart
@@ -395,8 +395,12 @@ class BuildMode {
       });
     }
 
-    Map<String, LinkedLibraryBuilder> linkResult =
-        link(sourceUris, _getDependency, _getUnit, options.strongMode);
+    Map<String, LinkedLibraryBuilder> linkResult = link(
+        sourceUris,
+        _getDependency,
+        _getUnit,
+        context.declaredVariables.get,
+        options.strongMode);
     linkResult.forEach(assembler.addLinkedLibrary);
   }
 }