Optimization: make FirFunctionCall an abstract class

compiler/fir/tree/src/org/jetbrains/kotlin/fir/expressions/FirComponentCall.kt

@@ -5,13 +5,18 @@
 
 package org.jetbrains.kotlin.fir.expressions
 
+import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.visitors.FirVisitor
 
-interface FirComponentCall : FirFunctionCall {
+abstract class FirComponentCall(
+    session: FirSession,
+    psi: PsiElement?
+) : FirFunctionCall(session, psi) {
     // Starting from 1, not from 0
-    val componentIndex: Int
+    abstract val componentIndex: Int
 
-    override val explicitReceiver: FirExpression
+    abstract override val explicitReceiver: FirExpression
 
     override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R =
         visitor.visitComponentCall(this, data)

compiler/fir/tree/src/org/jetbrains/kotlin/fir/expressions/FirFunctionCall.kt

@@ -5,13 +5,19 @@
 
 package org.jetbrains.kotlin.fir.expressions
 
+import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.fir.FirNamedReference
+import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.VisitedSupertype
+import org.jetbrains.kotlin.fir.expressions.impl.FirAbstractCall
 import org.jetbrains.kotlin.fir.types.FirTypeProjectionContainer
 import org.jetbrains.kotlin.fir.visitors.FirVisitor
 
-interface FirFunctionCall : @VisitedSupertype FirCall, FirQualifiedAccess, FirTypeProjectionContainer {
+abstract class FirFunctionCall(
-    override val calleeReference: FirNamedReference
+    session: FirSession,
+    psi: PsiElement?
+) : FirAbstractCall(session, psi), @VisitedSupertype FirCall, FirQualifiedAccess, FirTypeProjectionContainer {
+    abstract override val calleeReference: FirNamedReference
 
     override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R =
         visitor.visitFunctionCall(this, data)

compiler/fir/tree/src/org/jetbrains/kotlin/fir/expressions/impl/FirComponentCallImpl.kt

@@ -23,7 +23,7 @@ class FirComponentCallImpl(
     psi: PsiElement?,
     override val componentIndex: Int,
     override var explicitReceiver: FirExpression
-) : FirAbstractCall(session, psi), FirComponentCall {
+) : FirComponentCall(session, psi) {
     override fun <D> transformExplicitReceiver(transformer: FirTransformer<D>, data: D): FirQualifiedAccess {
         explicitReceiver = explicitReceiver.transformSingle(transformer, data)
         return this
@@ -43,6 +43,6 @@ class FirComponentCallImpl(
     override fun <D> transformChildren(transformer: FirTransformer<D>, data: D): FirElement {
         calleeReference = calleeReference.transformSingle(transformer, data)
         explicitReceiver = explicitReceiver.transformSingle(transformer, data)
-        return super<FirAbstractCall>.transformChildren(transformer, data)
+        return super.transformChildren(transformer, data)
     }
 }

compiler/fir/tree/src/org/jetbrains/kotlin/fir/expressions/impl/FirFunctionCallImpl.kt

@@ -18,7 +18,7 @@ class FirFunctionCallImpl(
     session: FirSession,
     psi: PsiElement?,
     override var safe: Boolean = false
-) : FirAbstractCall(session, psi), FirFunctionCall, FirModifiableQualifiedAccess {
+) : FirFunctionCall(session, psi), FirModifiableQualifiedAccess {
     override val typeArguments = mutableListOf<FirTypeProjection>()
 
     override lateinit var calleeReference: FirNamedReference
@@ -29,7 +29,7 @@ class FirFunctionCallImpl(
         typeArguments.transformInplace(transformer, data)
         calleeReference = calleeReference.transformSingle(transformer, data)
         explicitReceiver = explicitReceiver?.transformSingle(transformer, data)
-        return super<FirAbstractCall>.transformChildren(transformer, data)
+        return super<FirFunctionCall>.transformChildren(transformer, data)
     }
 
     override fun <D> transformCalleeReference(transformer: FirTransformer<D>, data: D): FirQualifiedAccess {