[FIR] Handle isProp/setProp synthetic pair properly in Java use-site scope

compiler/fir/java/src/org/jetbrains/kotlin/fir/java/scopes/JavaClassUseSiteMemberScope.kt

@@ -147,13 +147,14 @@ class JavaClassUseSiteMemberScope(
         if (symbol.fir !is FirJavaClass) {
             return super.processFunctionsByName(name, processor)
         }
-        val potentialPropertyName = session.syntheticNamesProvider.propertyNameByAccessorName(name)
+        val potentialPropertyNames = session.syntheticNamesProvider.possiblePropertyNamesByAccessorName(name)
-            ?: return super.processFunctionsByName(name, processor)
         val accessors = mutableListOf<FirAccessorSymbol>()
-        val getterName = session.syntheticNamesProvider.getterNameBySetterName(name) ?: name
+        val getterName by lazy { session.syntheticNamesProvider.getterNameBySetterName(name) ?: name }
-        processAccessorFunctionsAndPropertiesByName(potentialPropertyName, listOf(getterName)) {
+        for (potentialPropertyName in potentialPropertyNames) {
-            if (it is FirAccessorSymbol) {
+            processAccessorFunctionsAndPropertiesByName(potentialPropertyName, listOf(getterName)) {
-                accessors += it
+                if (it is FirAccessorSymbol) {
+                    accessors += it
+                }
             }
         }
         if (accessors.isEmpty()) {

compiler/fir/jvm/src/org/jetbrains/kotlin/fir/resolve/FirJavaSyntheticNamesProvider.kt

@@ -51,16 +51,22 @@ object FirJavaSyntheticNamesProvider : FirSyntheticNamesProvider() {
         return Name.identifier(GETTER_PREFIX + identifier.removePrefix(prefix))
     }
 
-    override fun propertyNameByAccessorName(name: Name): Name? {
+    override fun possiblePropertyNamesByAccessorName(name: Name): List<Name> {
-        if (name.isSpecial) return null
+        if (name.isSpecial) return emptyList()
         val identifier = name.identifier
         val prefix = when {
             identifier.startsWith(GETTER_PREFIX) -> GETTER_PREFIX
             identifier.startsWith(IS_PREFIX) -> ""
             identifier.startsWith(SETTER_PREFIX) -> SETTER_PREFIX
-            else -> return null
+            else -> return emptyList()
+        }
+        val withoutPrefix = identifier.removePrefix(prefix)
+        val withoutPrefixName = Name.identifier(withoutPrefix.decapitalize())
+        return if (prefix == SETTER_PREFIX) {
+            listOf(withoutPrefixName, Name.identifier(IS_PREFIX + withoutPrefix))
+        } else {
+            listOf(withoutPrefixName)
         }
-        return Name.identifier(identifier.removePrefix(prefix).decapitalize())
     }
 }
 

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/FirSyntheticNamesProvider.kt

@@ -13,7 +13,7 @@ abstract class FirSyntheticNamesProvider : FirSessionComponent {
     abstract fun possibleGetterNamesByPropertyName(name: Name): List<Name>
     abstract fun setterNameByGetterName(name: Name): Name?
     abstract fun getterNameBySetterName(name: Name): Name?
-    abstract fun propertyNameByAccessorName(name: Name): Name?
+    abstract fun possiblePropertyNamesByAccessorName(name: Name): List<Name>
 }
 
 val FirSession.syntheticNamesProvider: FirSyntheticNamesProvider by FirSession.sessionComponentAccessor()

compiler/testData/codegen/box/properties/commonPropertiesKJK.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 // TARGET_BACKEND: JVM
 
 // FILE: J.java