Simplify getIrFunctionByIrCall method in KFunctionState

Removed check of invoke symbols equality. Without this check it is
possible to store init functions in KFunctionState

compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/Utils.kt

@@ -39,8 +39,6 @@ internal fun IrFunctionAccessExpression.getBody(): IrBody? = this.symbol.owner.b
 
 internal fun IrFunctionAccessExpression.getThisReceiver(): IrValueSymbol = this.symbol.owner.parentAsClass.thisReceiver!!.symbol
 
-internal fun IrCall.isInvokeFun(): Boolean = this.origin == IrStatementOrigin.INVOKE || this.symbol.owner.name.asString() == "invoke"
-
 internal fun State.toIrExpression(expression: IrExpression): IrExpression {
     val start = expression.startOffset
     val end = expression.endOffset

compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/state/reflection/KFunctionState.kt

@@ -63,17 +63,12 @@ internal class KFunctionState(val irFunction: IrFunction, override val irClass:
         return _typeParameters!!
     }
 
-    private val invokeSymbol = irClass.declarations
-        .single { it.nameForIrSerialization.asString() == "invoke" }
-        .cast<IrSimpleFunction>()
-        .getLastOverridden().symbol
-
     fun getArity(): Int? {
         return irClass.name.asString().removePrefix("Function").removePrefix("KFunction").toIntOrNull()
     }
 
     override fun getIrFunctionByIrCall(expression: IrCall): IrFunction? {
-        return if (invokeSymbol == expression.symbol) irFunction else null
+        return if (expression.symbol.owner.name.asString() == "invoke") irFunction else null
     }
 
     private fun isLambda(): Boolean = irFunction.name.let { it == Name.special("<anonymous>") || it == Name.special("<no name provided>") }