Enum parsing changed: first entries, then members. Grammar fixed accordingly.

A set of compiler tests and some plugin tests changed accordingly.
Compiler Kotlin code changed accordingly.

idea/testData/navigation/implementations/EnumEntriesInheritance.kt

@@ -1,6 +1,4 @@
 enum class <caret>E {
-    open fun foo(n: Int): Int = n
-
     O
     A {
         override fun foo(n: Int): Int = n + 1
@@ -10,6 +8,8 @@ enum class <caret>E {
         override fun foo(n: Int): Int = n + 2
 
     }
+
+    open fun foo(n: Int): Int = n
 }
 
 // REF: (E).A

idea/testData/navigation/implementations/OverridesInEnumEntries.kt

@@ -1,6 +1,4 @@
 enum class E {
-    open fun <caret>foo(n: Int): Int = n
-
     O
     A {
         override fun foo(n: Int): Int = n + 1
@@ -10,6 +8,8 @@ enum class E {
         override fun foo(n: Int): Int = n + 2
 
     }
+
+    open fun <caret>foo(n: Int): Int = n
 }
 
 // REF: (in E.A).foo(Int)