[FIR] Properly set isOperator flag for java functions

^KT-56875 Fixed

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/FirJavaFacade.kt

@@ -569,9 +569,6 @@ abstract class FirJavaFacade(
                 javaMethod.visibility.toEffectiveVisibility(dispatchReceiver.lookupTag)
             ).apply {
                 isStatic = javaMethod.isStatic
-                // Approximation: all Java methods with name that allows to use it in operator form are considered operators
-                // We need here more detailed checks (see modifierChecks.kt)
-                isOperator = name in ALL_JAVA_OPERATION_NAMES || OperatorNameConventions.COMPONENT_REGEX.matches(name.asString())
                 hasStableParameterNames = false
             }
 

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/enhancement/SignatureEnhancement.kt

@@ -25,8 +25,8 @@ import org.jetbrains.kotlin.fir.declarations.utils.*
 import org.jetbrains.kotlin.fir.expressions.FirAnnotation
 import org.jetbrains.kotlin.fir.expressions.FirConstExpression
 import org.jetbrains.kotlin.fir.expressions.unexpandedClassId
+import org.jetbrains.kotlin.fir.java.*
 import org.jetbrains.kotlin.fir.java.FirJavaTypeConversionMode
-import org.jetbrains.kotlin.fir.java.JavaTypeParameterStack
 import org.jetbrains.kotlin.fir.java.declarations.*
 import org.jetbrains.kotlin.fir.java.resolveIfJavaType
 import org.jetbrains.kotlin.fir.java.symbols.FirJavaOverriddenSyntheticPropertySymbol
@@ -339,11 +339,20 @@ class FirSignatureEnhancement(
             if (isJavaRecordComponent) {
                 this.isJavaRecordComponent = true
             }
+            updateIsOperatorFlagIfNeeded(this)
         }
 
         return function.symbol
     }
 
+    private fun updateIsOperatorFlagIfNeeded(function: FirFunction) {
+        if (function !is FirSimpleFunction) return
+        val isOperator = OperatorFunctionChecks.isOperator(function, session, scopeSession = null).isSuccess
+        if (!isOperator) return
+        val newStatus = function.status.copy(isOperator = true)
+        function.replaceStatus(newStatus)
+    }
+
     /**
      * Perform first time initialization of bounds with FirResolvedTypeRef instances
      * But after that bounds are still not enhanced and more over might have not totally correct raw types bounds