Add accessor symbols & test for property overriding in Java

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirNamedFunction.kt

@@ -27,8 +27,6 @@ interface FirNamedFunction : @VisitedSupertype FirFunction, FirCallableMemberDec
 
     override val isOverride: Boolean get() = status.isOverride
 
-    override val symbol: FirFunctionSymbol
-
     override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R =
         visitor.visitNamedFunction(this, data)
 

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberFunctionImpl.kt

@@ -10,11 +10,9 @@ import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.Visibility
 import org.jetbrains.kotlin.fir.FirElement
 import org.jetbrains.kotlin.fir.FirSession
-import org.jetbrains.kotlin.fir.declarations.FirCallableDeclaration
-import org.jetbrains.kotlin.fir.declarations.FirNamedFunction
-import org.jetbrains.kotlin.fir.declarations.FirValueParameter
+import org.jetbrains.kotlin.fir.declarations.*
 import org.jetbrains.kotlin.fir.expressions.FirBlock
-import org.jetbrains.kotlin.fir.symbols.FirBasedSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.FirCallableSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
 import org.jetbrains.kotlin.fir.transformInplace
 import org.jetbrains.kotlin.fir.transformSingle
@@ -24,12 +22,12 @@ import org.jetbrains.kotlin.name.Name
 
 open class FirMemberFunctionImpl : FirAbstractCallableMember, FirNamedFunction, FirModifiableFunction {
 
-    override val symbol: FirFunctionSymbol
+    override val symbol: FirCallableSymbol
 
     constructor(
         session: FirSession,
         psi: PsiElement?,
-        symbol: FirFunctionSymbol,
+        symbol: FirCallableSymbol,
         name: Name,
         receiverTypeRef: FirTypeRef?,
         returnTypeRef: FirTypeRef

compiler/fir/tree/src/org/jetbrains/kotlin/fir/symbols/impl/FirAccessorSymbol.kt

@@ -0,0 +1,14 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.fir.symbols.impl
+
+import org.jetbrains.kotlin.fir.symbols.CallableId
+import org.jetbrains.kotlin.fir.symbols.ConePropertySymbol
+
+class FirAccessorSymbol(
+    override val callableId: CallableId,
+    val accessorId: CallableId
+) : ConePropertySymbol, FirCallableSymbol()