Do not weakly retain caches whose computation has side-effects

Lazy scopes write REFERENCE_TARGET to trace as a side-effect, when weak caches are cleared, resolution may be repeated, and a rewrite error happens

compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/ScopeProvider.java

@@ -47,7 +47,7 @@ public class ScopeProvider {
     public ScopeProvider(@NotNull ResolveSession resolveSession) {
         this.resolveSession = resolveSession;
 
-        this.fileScopes = resolveSession.getStorageManager().createWeaklyRetainedMemoizedFunction(new Function1<JetFile, JetScope>() {
+        this.fileScopes = resolveSession.getStorageManager().createMemoizedFunction(new Function1<JetFile, JetScope>() {
             @Override
             public JetScope invoke(@NotNull JetFile file) {
                 return createFileScope(file);