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/findUsages/kotlin/findFunctionUsages/enumFunctionUsages.0.kt

@@ -1,12 +1,6 @@
 // PSI_ELEMENT: org.jetbrains.kotlin.psi.JetNamedFunction
 // OPTIONS: usages
 enum class E {
-    init {
-        foo(1)
-    }
-
-    open fun <caret>foo(n: Int): Int = n
-
     O
     A {
         init {
@@ -22,4 +16,10 @@ enum class E {
 
         override fun foo(n: Int): Int = n + 2
     }
+
+    init {
+        foo(1)
+    }
+
+    open fun <caret>foo(n: Int): Int = n
 }

idea/testData/findUsages/kotlin/findFunctionUsages/enumFunctionUsages.results.txt

@@ -1,3 +1,3 @@
-Function call (13: 13) foo(1)
-Function call (20: 13) foo(1)
-Function call (5: 9) foo(1)
+Function call (14: 13) foo(1)
+Function call (21: 9) foo(1)
+Function call (7: 13) foo(1)