[FIR] Don't replace custom compareTo with default one in primitives

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/OperatorExpressionGenerator.kt

@@ -58,6 +58,10 @@ internal class OperatorExpressionGenerator(
             )
         }
 
+        if (comparisonExpression.compareToCall.toResolvedCallableSymbol()?.fir?.receiverTypeRef != null) {
+            return fallbackToRealCall()
+        }
+
         val comparisonInfo = comparisonExpression.inferPrimitiveNumericComparisonInfo() ?: return fallbackToRealCall()
         val comparisonType = comparisonInfo.comparisonType
 

compiler/testData/codegen/box/operatorConventions/compareTo/customCompareTo.kt

@@ -1,5 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
-
 var longCompareToInvocations = 0
 var doubleCompareToInvocations = 0