IG: compile time constants may be 'static' even if they are contained in an anonymous class

plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/performance/FieldMayBeStaticInspection.java

@@ -81,7 +81,7 @@ public class FieldMayBeStaticInspection extends BaseInspection {
         // inner class cannot have static declarations
         return;
       }
-      if (containingClass instanceof PsiAnonymousClass) {
+      if (containingClass instanceof PsiAnonymousClass && !PsiUtil.isCompileTimeConstant(field)) {
         return;
       }
       if (!canBeStatic(initializer)) {

plugins/InspectionGadgets/test/com/siyeh/igtest/performance/field_may_be_static/FieldMayBeStatic.java

@@ -19,6 +19,7 @@ public class FieldMayBeStatic
         public void run() {
 
             new Namer() {
+                final String <warning descr="Field 'constant' may be 'static'">constant</warning> = "";
                 final String usage = "Usage: " + getString();
                 public void action() {