FIR: fix lookup tracking in conflicts checker for LT

since it relies on the correct context declaration

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirConflictsChecker.kt

@@ -222,6 +222,8 @@ object FirConflictsChecker : FirBasicDeclarationChecker() {
             }
         }
 
+        context.addDeclaration(declaration)
+        try {
             inspector.declarationConflictingSymbols.forEach { (conflictingDeclaration, symbols) ->
                 val source = conflictingDeclaration.source
                 if (source != null && symbols.isNotEmpty()) {
@@ -260,6 +262,9 @@ object FirConflictsChecker : FirBasicDeclarationChecker() {
                     }
                 }
             }
+        } finally {
+            context.dropDeclaration()
+        }
     }
 
     private fun checkConflictingParameters(parameters: List<FirElement>, context: CheckerContext, reporter: DiagnosticReporter) {