Memory optimization: Do not retain LinkedHashSets in caches

LinkedHashSets are replaced with tight ArrayLists

core/descriptor.loader.java/src/org/jetbrains/jet/lang/resolve/java/lazy/descriptors/LazyJavaMemberScope.kt

@@ -100,7 +100,7 @@ public abstract class LazyJavaMemberScope(
             }
         }
 
-        functions
+        ArrayList(functions)
     }
 
     data class MethodSignatureData(
@@ -237,6 +237,7 @@ public abstract class LazyJavaMemberScope(
 
         computeNonDeclaredProperties(name, properties)
 
+        properties.trimToSize()
         properties
     }
 
@@ -323,7 +324,7 @@ public abstract class LazyJavaMemberScope(
 
         addExtraDescriptors(result)
 
-        return result
+        return ArrayList(result)
     }
 
     protected open fun addExtraDescriptors(result: MutableSet<DeclarationDescriptor>) {

core/serialization/src/org/jetbrains/jet/descriptors/serialization/descriptors/DeserializedMemberScope.java

@@ -135,7 +135,7 @@ public abstract class DeserializedMemberScope implements JetScope {
     private Collection<FunctionDescriptor> computeFunctions(@NotNull Name name) {
         Collection<FunctionDescriptor> descriptors = computeMembersByName(name, FUNCTION);
         computeNonDeclaredFunctions(name, descriptors);
-        return descriptors;
+        return new ArrayList<FunctionDescriptor>(descriptors);
     }
 
     protected void computeNonDeclaredFunctions(@NotNull Name name, @NotNull Collection<FunctionDescriptor> functions) {
@@ -152,7 +152,7 @@ public abstract class DeserializedMemberScope implements JetScope {
         Collection<PropertyDescriptor> descriptors = computeMembersByName(name, PROPERTY);
         computeNonDeclaredProperties(name, descriptors);
         //noinspection unchecked
-        return (Collection) descriptors;
+        return new ArrayList<VariableDescriptor>((Collection) descriptors);
     }
 
     protected void computeNonDeclaredProperties(@NotNull Name name, @NotNull Collection<PropertyDescriptor> descriptors) {