K2: don't report REDECLARATION on Enum.entries

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/FirDeclarationInspector.kt

@@ -233,6 +233,7 @@ private val NO_NAME_PROVIDED = Name.special("<no name provided>")
 // you can't redeclare something that has no name.
 private fun FirDeclaration.isCollectable() = when (this) {
     is FirSimpleFunction -> source?.kind !is KtFakeSourceElementKind && name != NO_NAME_PROVIDED
+    is FirProperty -> source?.kind !is KtFakeSourceElementKind.EnumGeneratedDeclaration
     is FirRegularClass -> name != NO_NAME_PROVIDED
     else -> true
 }

compiler/testData/diagnostics/tests/enum/enumEntriesAmbiguity.fir.kt

@@ -1,8 +1,8 @@
 // !LANGUAGE: +EnumEntries
 // FIR_DUMP
 
-enum class <!REDECLARATION!>Ambiguous<!> {
-    first, <!REDECLARATION!>entries<!>;
+enum class Ambiguous {
+    first, entries;
 }
 
 val e = Ambiguous.<!OVERLOAD_RESOLUTION_AMBIGUITY!>entries<!>